Anti-stress growth-promoting poultry compound feed and preparation method thereof

Abstract

The application relates to the technical field of poultry feed processing, and discloses a stress-resistant growth-promoting poultry compound feed and a preparation method thereof, which is prepared from 96.8-98.1 parts of a basic daily ration module, 1.5-2.5 parts of a stress-resistant phase change core powder, 0.3-0.5 parts of a phase change initiator and 0.1-0.2 parts of a flow phase isolation agent according to weight. During preparation, the phase change initiator promotes the hydrogen bond coupling of the core powder, the high specific surface area adsorption of the isolation agent avoids the agglomeration of the powder into blocks, and the loose flow of the material is maintained; in the steam conditioning stage, the system triggers in-situ low-eutectic phase change, forms a network structure to accommodate the stress-resistant active ingredients which are heat-sensitive, and then is extruded, cooled and solidified. The application helps to reduce the damage of the high-temperature and high-humidity processing environment to the heat-sensitive ingredients, improves the retention rate and mixing uniformity of the effective ingredients in the finished product, and is beneficial to the absorption and utilization of the poultry body to relieve the stress reaction.

Description

Technical Field

[0001] This invention relates to the field of poultry feed processing technology, specifically to a stress-resistant and growth-promoting compound feed for poultry and its preparation method. Background Technology

[0002] In modern high-density poultry farming, poultry often experience stress responses due to factors such as changes in environmental temperature, flock transfer, or immunization. To alleviate stress and maintain normal growth performance, specific anti-stress activating substances are usually added to the feed formulation. To improve feed conversion ratio and facilitate poultry consumption, most modern poultry compound feeds are processed into pellets through steam conditioning and roller extrusion. However, under the high temperature, high humidity, and strong shear force conditions associated with pelleting, heat-sensitive anti-stress components directly mixed into the feed are prone to degradation, resulting in a low actual retention rate of effective substances in the finished feed. Consequently, the expected anti-stress and growth-promoting effects are difficult to achieve after ingestion by poultry.

[0003] To reduce the loss of active ingredients during thermal processing, some existing processes attempt to pretreat the core powder by introducing exogenous liquid solubilizers or protective additives during the mixing stage, hoping to improve its processing stability through inter-material interactions. These treatments often alter the physical properties of the powder surface, making it more viscous and causing particle agglomeration. Once the powder loses its original loose, free-flowing state, it easily leads to uneven distribution of core functional components in the basic staple diet. This decrease in mixing uniformity can cause significant deviations in the content of anti-stress components in different particles within the same batch of feed, resulting in individual differences in the dosage ingested by each bird and ultimately affecting overall farming efficiency. Therefore, how to improve the thermal processing stability of anti-stress components while overcoming powder agglomeration to ensure mixing uniformity through improvements in raw material formulation is a pressing practical problem in feed processing and production. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an anti-stress and growth-promoting compound feed for poultry and its preparation method. The aim is to solve the problems in existing technologies where the anti-stress components of poultry feed are prone to thermal degradation under high temperature and high humidity pelleting conditions, resulting in low retention rates, and where the powder tends to stick and agglomerate during the pretreatment of active ingredients, leading to poor material flowability and low mixing uniformity.

[0005] To address the above problems, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a stress-resistant and growth-promoting compound feed for poultry, employing the following technical solution:

[0007] A stress-resistant and growth-promoting compound feed for poultry, made from the following raw materials in parts by weight per 100 parts total weight:

[0008] Basic ration module: 96.8-98.1 servings;

[0009] Stress-resistant phase change core powder: 1.5-2.5 parts;

[0010] Phase change initiator: 0.3-0.5 parts;

[0011] Mobile phase separator: 0.1-0.2 parts.

[0012] By adopting the above technical solution, the basic diet module provides the essential nutrients required for poultry growth, while introducing stress-resistant phase change core powder, phase change initiator, and mobile phase isolator in specific proportions. This helps improve the stability and final retention rate of the stress-resistant components in subsequent processing. During this process, hydrogen bond donors and acceptors on the powder surface undergo intermolecular interactions under the action of the phase change initiator, resulting in an in-situ eutectic phase change. This phase change phenomenon typically forms a network-like liquid phase with encapsulation properties, containing the relatively easily thermally degradable stress-resistant activating components within this liquid phase system. Subsequently, the mobile phase isolator, uniformly dispersed around the liquid phase, utilizes its high specific surface area to adsorb excess free liquid phase. In this way, materials that might otherwise aggregate are physically separated, inhibiting excessive adhesion between particles, allowing the system to maintain a relatively loose, free-flowing state during subsequent processing.

[0013] Preferably, the stress-resistant phase change core powder is formulated from anhydrous betaine, citric acid monohydrate and γ-aminobutyric acid, and the molar ratio of anhydrous betaine, citric acid monohydrate and γ-aminobutyric acid is 1.0:1.0:(0.15-0.20).

[0014] By employing the above technical solution, the quaternary ammonium and carboxyl groups in the anhydrous betaine structure can act as hydrogen bond acceptors, while citric acid monohydrate, containing multiple carboxyl and hydroxyl groups, acts as a multiple hydrogen bond donor. When the two are mixed in a molar ratio of 1.0:1.0, an intermolecular coupling reaction generally occurs, generating a betaine-citric acid eutectic complex system. This system constitutes a three-dimensional hydrogen bond network structure. γ-aminobutyric acid (GABA) is dispersed within this network, forming a certain steric hindrance effect, which helps to delay the thermosensitive degradation caused by high temperature and high humidity environments. Controlling the molar ratio of GABA addition within the range of 0.15-0.20 helps maintain the relative integrity of the hydrogen bond network structure and prevents structural instability of the complex system due to excessive exogenous molecules.

[0015] Preferably, the basic diet module includes corn, soybean meal, limestone powder, and poultry trace element premix; the corn and soybean meal in the basic diet module are dry-crushed using a hammer mill to control the particle size to pass through a 2.0mm standard sieve.

[0016] By adopting the above technical solution, corn and soybean meal provide carbohydrates and protein, limestone powder supplements calcium, and the micronutrient premix meets the physiological and metabolic needs of poultry. Controlling the particle size to ensure complete passage through a 2.0mm standard sieve provides a suitable specific surface area for the powder, which not only facilitates the uniform dispersion of the basal diet powder and the stress-resistant phase change core powder during the mixing process, but also provides a better solid-liquid interface for moisture and heat transfer during the subsequent steam conditioning process.

[0017] Preferably, the phase change initiator is feed-grade glycerol, and the mobile phase separator is feed-grade precipitated silica.

[0018] By adopting the above technical solution, feed-grade glycerol contains three free hydroxyl groups in its molecular structure. These hydroxyl groups can act as exogenous hydrogen bond donors, penetrating into the phase interface of the stress-resistant phase change core powder. They compete with citric acid monohydrate and anhydrous betaine to form new hydrogen bonds, thereby helping to lower the phase change temperature threshold of the system and making it easier for the solid powder to be converted into a eutectic liquid phase at lower processing temperatures. On the other hand, feed-grade precipitated silica has a three-dimensional network structure and a large number of surface silanol groups. Through physical adsorption and surface hydrogen bonding, it can fix the induced liquid phase in its pores and surface, thereby mitigating the problem of scale adhesion to the inner wall of equipment caused by liquid phase leakage to a certain extent.

[0019] Preferably, the stress-resistant and growth-promoting poultry compound feed is a finished pellet formed under pressure roller extrusion, and the final finished product moisture content is reduced to below 12.0%.

[0020] By adopting the above technical solutions, forming under pressure rollers helps to improve the bulk density and mechanical strength of feed pellets, which to some extent reduces the pulverization and grading of feed products during transportation. Reducing the moisture content of the final product to below 12.0% helps to lower the water activity within the feed system, thereby inhibiting the growth and metabolism of harmful microorganisms such as molds, and thus extending the product's storage period.

[0021] Secondly, the present invention provides a method for preparing stress-resistant and growth-promoting compound feed for poultry, employing the following technical solution:

[0022] A method for preparing stress-resistant and growth-promoting compound feed for poultry includes the following steps:

[0023] The corn and soybean meal in the basic diet module are dry-crushed using a hammer mill to ensure that the particle size passes through a 2.0mm standard sieve. Then, they are mixed evenly with the stone powder and poultry trace element premix in the basic diet module and set aside.

[0024] The stress-resistant phase change core powder is put into a premixer for premixing, and the preheated phase change initiator is sprayed onto the surface of the stress-resistant phase change core powder in a dynamic rolling state.

[0025] After spraying, maintain mechanical stirring to cause hydrogen bonding on the surface of the stress-resistant phase change core powder, resulting in a slightly viscous state. While the stress-resistant phase change core powder is in a slightly viscous state, immediately add a mobile phase isolating agent to the premixer and vigorously disperse and mix until the stress-resistant phase change core powder returns to a loose and free-flowing state, thus obtaining the pre-initiated core powder.

[0026] The prepared pre-initiated core powder and the prepared basic diet module are put into a twin-shaft paddle mixer for mixing to obtain the initial mixed powder.

[0027] The initial mixed powder is continuously fed into a stainless steel steam conditioner, and saturated steam is introduced to trigger an in-situ eutectic phase transformation.

[0028] After hydrothermal conditioning, the wet hot powder flows into the ring die pellet mill by gravity and is formed under the extrusion of the pressure rollers. The hot granules are directly fed into the counter-flow cooler for heat exchange along with the chassis, and the moisture content of the final product is reduced to below 12.0%.

[0029] By employing the above technical solution and combining physical and thermodynamic control processes, it is helpful to achieve stable solidification of anti-stress components in feed. In the premixing stage, a phase change initiator is sprayed and penetrates the surface of the core powder particles, establishing a preliminary hydrogen-bonded interface, causing the powder particles to exhibit a slightly viscous state with trace amounts of liquid phase. Immediately afterwards, a separating agent is added, which rapidly absorbs the free liquid phase on the surface, preventing further agglomeration and growth between particles, thereby redispersing the slightly viscous particles into discrete solid powder. This provides conditions for the uniform distribution of the pre-initiated core powder in the basic bulk raw materials. In a conditioner saturated with steam, the steam provides the mass transfer medium and heat energy. When the ambient temperature rises to a certain level, the phase change energy barrier between the core components is broken, and the solid raw materials undergo an in-situ eutectic phase change, forming a network liquid phase system. This liquid phase system partially penetrates into the pores of the gelatinized starch in the basic raw material. After extrusion molding, the hot granules dissipate heat in the countercurrent cooling process. When the temperature of the eutectic liquid network drops below the glass transition temperature, it transforms into a solid matrix, essentially completing the physical sealing of the reactive activating components.

[0030] Preferably, the process of feeding the stress-resistant phase change core powder into a premixer for premixing and ultimately obtaining the pre-initiated core powder specifically includes:

[0031] Premix for 1-2 minutes at a spindle speed of 60-80 rpm in the premixer;

[0032] The phase change initiator is preheated to 35-40℃ in the jacketed storage tank;

[0033] The phase change initiator is sprayed continuously and uniformly over 60-90 seconds with an average droplet size of 50-100µm.

[0034] The mechanical stirring time after spraying is 2-3 minutes;

[0035] After adding the mobile phase separator, vigorously disperse and mix at a speed of 1000-1500 rpm for 2-3 minutes.

[0036] By employing the above technical solution, preheating the phase change initiator to 35-40℃ helps reduce its kinematic viscosity and improve surface tension. Combined with a droplet size of 50-100µm, this increases the interfacial contact area between the phase change initiator and the core powder, which can, to some extent, prevent material agglomeration caused by localized liquid supersaturation. After adding the mobile phase separator, a rotation speed of 1000-1500 rpm provides high mechanical shear force. This shear force breaks down the soft aggregates between powder particles, allowing the separator particles to be more uniformly dispersed on the outside of the core powder particles. This results in a pre-initiated powder with a good angle of repose and good mixing uniformity.

[0037] Preferably, the process of continuously feeding the initial mixed powder into a stainless steel steam conditioner and introducing saturated steam to trigger an in-situ eutectic phase transformation specifically includes:

[0038] Maintain the conditioning temperature at 72-78℃, the output moisture content at 14.5%-15.5%, and control the residence time of the material in the stainless steel steam conditioner to 45-60 seconds.

[0039] By adopting the above technical solution, a conditioning temperature of 72-78℃ and a discharge moisture content of 14.5%-15.5% together constitute the thermodynamic critical conditions for the phase transition of the eutectic system. The latent heat of vaporization released by the steam provides activation energy, allowing the phase transition reaction to be completed within a limited time, while also helping to avoid the thermal decomposition of components such as γ-aminobutyric acid due to excessively high temperatures. The residence time of 45-60 seconds allows moisture and heat to penetrate into the particle interior relatively fully, promoting the appropriate gelatinization of starch in the basal diet and enabling better miscibility between the gelatinized starch and the eutectic phase transition products.

[0040] Preferably, in the process where the hydrothermally conditioned wet hot powder flows by gravity into the ring die pellet mill, is formed under the extrusion of the pressure rollers, and the hot granules directly enter the counter-flow cooler for heat exchange, the final product moisture content is reduced to below 12.0%, specifically including:

[0041] Stainless steel ring dies with a compression ratio of 1:6 to 1:8 are selected;

[0042] Use room temperature air for ventilation and heat exchange for 10-15 minutes to reduce the temperature of the finished granules to no more than 5°C above the ambient room temperature.

[0043] By adopting the above technical solution and selecting a stainless steel ring die with a compression ratio of 1:6 to 1:8, the material can be subjected to appropriate radial compressive stress and axial friction within the die channels, which helps to improve the hardness and forming rate of feed pellets. The exhaust heat exchange process uses flowing air to remove the sensible heat from the surface of the pellets, promoting the evaporation and diffusion of moisture from inside the pellets. When the pellet temperature drops to no more than 5°C above ambient temperature, the molecular chain segment movement of the eutectic phase change system tends to stagnate, and the system achieves rigid solidification, which is beneficial for maintaining the three-dimensional structure of nutrients.

[0044] Preferably, after the production of this batch of feed is completed and the stainless steel steam conditioner is emptied, the steam valve is closed, and the final passivation cleaning material is continuously fed into the stainless steel steam conditioner and the ring die pellet mill, and then extruded and discharged at room temperature through the ring die pellet mill.

[0045] The final passivation cleaning material formula is 95.0% corn husk, 3.0% stone powder and 2.0% soybean oil.

[0046] By employing the above technical solutions, residual materials containing acidic citric acid components often remain on the inner walls of the equipment after production. Corn husks, rich in coarse fiber, generate strong physical friction during mechanical propulsion, helping to scrape away the residual materials adhering to the inner walls. The calcium carbonate component in stone powder undergoes an acid-base neutralization reaction upon contact with the acidic residue, mitigating the risk of localized acid corrosion. Under the combined effects of material extrusion and friction, soybean oil is evenly coated onto the stainless steel metal contact surfaces, forming a hydrophobic oil film that blocks moisture and oxygen from the air. This plays a positive role in passivation, corrosion prevention, and extending the equipment's service life.

[0047] This invention provides an anti-stress, growth-promoting compound feed for poultry and its preparation method. It has the following beneficial effects:

[0048] 1. This invention utilizes a specific anti-stress phase change core powder combined with a phase change initiator to trigger an in-situ eutectic phase change during the subsequent steam conditioning process. The complex system formed by anhydrous betaine and citric acid monohydrate accommodates γ-aminobutyric acid. This structure, to a certain extent, mitigates the damage to the heat-sensitive anti-stress components caused by the high-temperature and high-humidity granulation environment, thus improving the final retention rate of effective active substances in the finished granules.

[0049] 2. In the preparation process, this invention introduces a mobile phase isolating agent at the appropriate time, utilizing its high specific surface area to promptly adsorb the trace amounts of free liquid phase generated on the surface of the core powder during the initiation stage. This operation reduces excessive adhesion between material particles, allowing the slightly viscous powder to regain and maintain a good loose and free-flowing state, thereby helping to improve the overall mixing uniformity of the core functional components in the basic staple food.

[0050] 3. After the completion of a regular production batch, this invention uses a final passivation cleaning material made of corn husks, stone powder, and soybean oil to treat the equipment. The mechanical friction of the coarse fibers removes residue from the inner wall, while the neutralizing effect of the stone powder reduces residual acidity. Finally, soybean oil forms a hydrophobic protective layer on the metal contact surface. This has a positive effect on mitigating the corrosion risk of acidic materials on the processing equipment and on routine equipment maintenance. Attached Figure Description

[0051] Figure 1 These are differential scanning calorimeters of each test object in Test Example 1 of this invention.

[0052] Figure 2 This is the electrochemical potentiodynamic polarization curve in Test Example 2 of this invention.

[0053] Figure 3 These are high-performance liquid chromatograms of the target components of each test object in Test Example 3 of this invention. Detailed Implementation

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Example 1: This example provides a method for preparing stress-resistant and growth-promoting compound feed for poultry, including the following steps:

[0056] Weigh out 97.45 parts by weight of the basal diet module, which contains corn, soybean meal, limestone powder, and poultry micronutrient premix, based on a total mass of 100 parts by weight. Dry-crush the corn and soybean meal from the basal diet module using a hammer mill, ensuring the particle size passes completely through a 2.0mm standard sieve. Then, mix them thoroughly with the limestone powder and poultry micronutrient premix from the basal diet module.

[0057] Weigh 2.0 parts by weight of the anti-stress phase change core powder, which is prepared by anhydrous betaine, citric acid monohydrate, and γ-aminobutyric acid in a molar ratio of 1.0:1.0:0.18. Add the above anti-stress phase change core powder to a stainless steel micro-premixer equipped with a high-shear blade and premix for 1.5 minutes at a spindle speed of 70 rpm. Weigh 0.4 parts by weight of the phase change initiator, feed-grade glycerol, and preheat it to 38°C in a jacketed storage tank. Start the dual-fluid atomizing nozzle on the top of the premixer and adjust the compressed air pressure to 0.35 MPa, so that the glycerol, with an average droplet size of 80 µm, is continuously and uniformly sprayed onto the surface of the dynamically tumbling anti-stress phase change core powder within 75 seconds. After spraying, maintain mechanical stirring for 2.5 minutes to allow hydrogen bonding to occur on the surface of the anti-stress phase change core powder, resulting in a slightly viscous state. When the stress-resistant phase change core powder is in a slightly viscous state, immediately add 0.15 parts by weight of feed-grade precipitated silica, the mobile phase isolator, to the premixer. Turn on the high-shear blade of the premixer and vigorously disperse and mix at 1200 rpm for 2.5 minutes until the stress-resistant phase change core powder returns to a loose, free-flowing state, thus obtaining the pre-initiated core powder.

[0058] The prepared pre-initiated core powder and the prepared basal diet module were fed into a bi-shaft paddle mixer. The mixing time was set to 105 seconds to ensure that the coefficient of variation of the mixing uniformity of the entire batch of materials was less than or equal to 5%, thus obtaining the initial mixed powder.

[0059] The initial mixed powder is continuously fed into a stainless steel steam conditioner, through which saturated steam is introduced. The conditioning temperature is strictly maintained at 75°C, the output moisture content is 15.0%, and the residence time of the material in the conditioner is controlled at 50 seconds to trigger the in-situ eutectic phase transformation.

[0060] The hydrothermally conditioned wet powder flows by gravity into a ring die pellet mill. A stainless steel ring die with a compression ratio of 1:7 is used to form pellets under the pressure of the rollers. The hot pellets enter the counter-flow cooler directly from the chassis. The cooler uses room temperature air for heat exchange for 12 minutes to reduce the temperature of the finished pellets to no more than 5°C above the ambient temperature. The final moisture content of the finished product is reduced to below 12.0%, and then it is screened and packaged.

[0061] After the production of this batch of feed is completed and the stainless steel steam conditioner is emptied, the steam valve is closed. 75 kg of final passivation cleaning feed is continuously fed into the conditioner and pellet mill. The formula of this cleaning feed is 95.0% corn husk, 3.0% limestone powder, and 2.0% soybean oil. This cleaning feed is extruded and discharged at room temperature through a ring die, neutralizing the acidic residue on the inner wall of the equipment and forming a hydrophobic oil film on the metal surface. The machine is then completely shut down.

[0062] Example 2: This example provides a method for preparing stress-resistant and growth-promoting compound feed for poultry, including the following steps:

[0063] Weigh out 96.8 parts by weight of the basal diet module, which contains corn, soybean meal, limestone powder, and poultry micronutrient premix, based on a total mass of 100 parts by weight. Dry-crush the corn and soybean meal from the basal diet module using a hammer mill, ensuring the particle size passes completely through a 2.0mm standard sieve. Then, mix them evenly with the limestone powder and poultry micronutrient premix from the basal diet module and set aside.

[0064] Weigh 2.5 parts by weight of the anti-stress phase change core powder, which is prepared by anhydrous betaine, citric acid monohydrate, and γ-aminobutyric acid in a molar ratio of 1.0:1.0:0.20. Add the above anti-stress phase change core powder to a stainless steel micro-premixer equipped with a high-shear blade and premix for 2 minutes at a spindle speed of 80 rpm. Weigh 0.5 parts by weight of the phase change initiator, feed-grade glycerol, and preheat it to 40°C in a jacketed storage tank. Start the dual-fluid atomizing nozzle on the top of the premixer and adjust the compressed air pressure to 0.4 MPa, so that glycerol, with an average droplet size of 100 µm, is continuously and uniformly sprayed onto the surface of the dynamically tumbling anti-stress phase change core powder within 90 seconds. After spraying, maintain mechanical stirring for 3 minutes to allow hydrogen bonding to occur on the surface of the anti-stress phase change core powder, resulting in a slightly viscous state. When the stress-resistant phase change core powder is in a slightly viscous state, immediately add 0.2 parts by weight of feed-grade precipitated silica, the mobile phase isolator, into the premixer. Turn on the high-shear blade of the premixer and vigorously disperse and mix at 1500 rpm for 3 minutes until the stress-resistant phase change core powder returns to a loose, free-flowing state, thus obtaining the pre-initiated core powder.

[0065] The prepared pre-initiated core powder and the prepared basal diet module were fed into a bi-shaft paddle mixer. The mixing time was set to 120 seconds to ensure that the coefficient of variation of the uniformity of the entire batch of materials was less than or equal to 5%, thus obtaining the initial mixed powder.

[0066] The initial mixed powder is continuously fed into a stainless steel steam conditioner, through which saturated steam is introduced. The conditioning temperature is strictly maintained at 78°C, the output moisture content is 15.5%, and the residence time of the material in the conditioner is controlled at 60 seconds to trigger the in-situ eutectic phase transformation.

[0067] The hydrothermally conditioned wet powder flows by gravity into a ring die pellet mill. A stainless steel ring die with a compression ratio of 1:8 is used to form pellets under the pressure of the rollers. The hot pellets enter the counter-flow cooler directly from the chassis. The cooler uses room temperature air for heat exchange for 15 minutes to reduce the temperature of the finished pellets to no more than 5°C above the ambient temperature. The final moisture content of the finished product is reduced to below 12.0%, and then it is screened and packaged.

[0068] After the production of this batch of feed is completed and the stainless steel steam conditioner is emptied, the steam valve is closed. 100 kg of final passivation cleaning feed is continuously fed into the conditioner and pellet mill. The formula of this cleaning feed is 95.0% corn husk, 3.0% limestone powder, and 2.0% soybean oil. This cleaning feed is extruded and discharged at room temperature through a ring die, neutralizing the acidic residue on the inner wall of the equipment and forming a hydrophobic oil film on the metal surface. The machine is then completely shut down.

[0069] Example 3: This example provides a method for preparing stress-resistant and growth-promoting compound feed for poultry, including the following steps:

[0070] Weigh out 98.1 parts by weight of the basal diet module, which contains corn, soybean meal, limestone powder, and poultry micronutrient premix, based on a total mass of 100 parts by weight. Dry-crush the corn and soybean meal from the basal diet module using a hammer mill, ensuring the particle size completely passes through a 2.0mm standard sieve. Then, mix them evenly with the limestone powder and poultry micronutrient premix from the basal diet module and set aside.

[0071] Weigh 1.5 parts by weight of the anti-stress phase change core powder, which is prepared by anhydrous betaine, citric acid monohydrate, and γ-aminobutyric acid in a molar ratio of 1.0:1.0:0.15. Add the above anti-stress phase change core powder to a stainless steel micro-premixer equipped with a high-shear blade and premix for 1 minute at a spindle speed of 60 rpm. Weigh 0.3 parts by weight of the phase change initiator, feed-grade glycerol, and preheat it to 35°C in a jacketed storage tank. Start the dual-fluid atomizing nozzle on the top of the premixer and adjust the compressed air pressure to 0.3 MPa, so that glycerol, with an average droplet size of 50 µm, is continuously and uniformly sprayed onto the surface of the dynamically tumbling anti-stress phase change core powder within 60 seconds. After spraying, maintain mechanical stirring for 2 minutes to allow hydrogen bonding to occur on the surface of the anti-stress phase change core powder, resulting in a slightly viscous state. When the stress-resistant phase change core powder is in a slightly viscous state, immediately add 0.1 parts by weight of feed-grade precipitated silica, the mobile phase isolator, into the premixer. Turn on the high-shear blade of the premixer and vigorously disperse and mix at 1000 rpm for 2 minutes until the stress-resistant phase change core powder returns to a loose, free-flowing state, thus obtaining the pre-initiated core powder.

[0072] The prepared pre-initiated core powder and the prepared basal diet module were fed into a bi-shaft paddle mixer. The mixing time was set to 90 seconds to ensure that the coefficient of variation of the uniformity of the entire batch of materials was less than or equal to 5%, thus obtaining the initial mixed powder.

[0073] The initial mixed powder is continuously fed into a stainless steel steam conditioner, through which saturated steam is introduced. The conditioning temperature is strictly maintained at 72°C, the output moisture content is 14.5%, and the residence time of the material in the conditioner is controlled at 45 seconds to trigger the in-situ eutectic phase transformation.

[0074] The hydrothermally conditioned wet powder flows by gravity into a ring die pellet mill. A stainless steel ring die with a compression ratio of 1:6 is used to form pellets under the pressure of the rollers. The hot pellets enter the counter-flow cooler directly from the chassis. The cooler uses room temperature air for heat exchange for 10 minutes to reduce the temperature of the finished pellets to no more than 5°C above the ambient temperature. The final moisture content of the finished product is reduced to below 12.0%, and then it is screened and packaged.

[0075] After the production of this batch of feed is completed and the stainless steel steam conditioner is emptied, the steam valve is closed. 50 kg of final passivation cleaning feed is continuously fed into the conditioner and pellet mill. The feed formulation consists of 95.0% corn husks, 3.0% limestone powder, and 2.0% soybean oil. This cleaning feed is extruded and discharged at room temperature using a ring die, neutralizing acidic residues on the inner walls of the equipment and forming a hydrophobic oil film on the metal surface. The machine is then completely shut down.

[0076] Comparative Example 1: The difference compared to Example 1 is as follows:

[0077] The feed-grade glycerol phase change initiator and feed-grade precipitated silica mobile phase separator were not added, and the amount of the corresponding basic diet module was supplemented to 98.0 parts by weight. The two-stage micro-pretreatment steps were omitted in the preparation method, and the stress-resistant phase change core powder was directly mechanically mixed with the basic diet module. In the steam conditioning stage, the conditioning temperature was set to the traditional 85℃, and the rest were the same.

[0078] Comparative Example 2: The difference compared to Example 1 is as follows:

[0079] The feeding and atomization sequence of the materials were changed, failing to achieve early targeted initiation of trace core powders. Specifically, two-stage microscopic pretreatment steps were omitted during preparation. The stress-resistant phase change core powder, feed-grade precipitated silica, and basal diet module were directly fed into a biaxial paddle mixer for mixing. Subsequently, preheated feed-grade glycerol was atomized and sprayed onto the surface of the entire material in the mixer. The amounts of basal diet module, stress-resistant phase change core powder, feed-grade glycerol, and feed-grade precipitated silica added were the same as in Example 1, and all other amounts were the same.

[0080] Comparative Example 3: The difference compared to Example 1 is as follows:

[0081] Feed-grade precipitated silica was not added as a mobile phase separator, and the amount added to the corresponding basic diet module was increased to 97.6 parts by weight. In the preparation method, after spraying feed-grade glycerol onto the core powder and making it slightly viscous, the subsequent macroscopic matrix recombination step was carried out directly, omitting the operation steps of adding precipitated silica and strong dispersion and mixing. All other steps were the same.

[0082] Comparative Example 4: The difference compared to Example 1 is as follows:

[0083] This deviates from the specific thermodynamic conditioning parameters. Specifically, during the steam conditioning stage, instead of using the 72°C to 78°C protection range, the conditioning temperature was set to 85°C, while the rest remained the same.

[0084] Test Example 1:

[0085] Experimental Procedure: Weigh 5.2 mg of anhydrous betaine monomer, 5.4 mg of citric acid monohydrate monomer, 5.3 mg of the mixed powder prepared according to Example 1 but before the conditioning process, and 5.6 mg of the finished granules after the process in Example 1. Grind, extract, and enrich the core component powders obtained, and use them as comparative test objects. Press the sampled powders into translucent flakes using a hydraulic press using the potassium bromide tableting method. Start the spectrometer and set the scanning range to 4000 cm⁻¹. -1 Up to 400cm -1 The scanning resolution is set to 4cm. -1The system performed 32 consecutive interferometric scans at room temperature to collect spectral interferometric data from each sample.

[0086] The four groups of powder test objects collected above were respectively laid in an agate mortar for crushing and grinding, and then spread evenly in the center of a fixed quartz glass tank and compacted. The testing equipment was turned on, and copper target Kα rays were selected as the radiation source. The working voltage of the optical tube was adjusted to 40kV and the working tube current to 40mA. The scanning range of the diffraction angle 2θ was set to span 5° to 60°, the step size was set to 0.02°, and the detection time at each step was 0.5 seconds. The peak value of the diffraction signal fed back by the sample was captured and recorded in real time.

[0087] Thermodynamic tests were performed under a high-purity nitrogen atmosphere at a flow rate of 50 mL / min. Powder samples ranging from 6.5 mg to 7.8 mg were weighed and placed into aluminum crucibles, which were then sealed with rolled edges using a cold press. These crucibles were then placed side-by-side with a reference aluminum crucible into the testing furnace. A linear heating rate of 10 °C / min was established using a temperature control program. The heating was monitored within the range of 30 °C to 350 °C, and the endothermic and exothermic flow data of the phase transition during heating were continuously tracked to extract thermodynamic parameters.

[0088] Experimental data:

[0089] Table 1. Thermodynamic parameters and characteristic absorption band data of each test object

[0090] Test object <![CDATA[Positions of characteristic absorption peaks related to carboxyl / carboxylate (cm -1 )]]> XRD diffraction peaks showing obvious sharp crystallization characteristics (number of peaks) Main endothermic peak temperature (°C) Anhydrous betaine monomer 1624.52 14 296.83 Citric acid monohydrate monomer 1745.31 22 102.16 Example 1: Powder before conditioning 1728.871618.39 18 98.45281.76 Example 1: Conditioned Powder 1689.44 0 62.58

[0091] Conclusion: According to the data in Table 1, the characteristic absorption peak related to the carboxyl / carboxylate group of the anhydrous betaine monomer is located at 1624.52 cm⁻¹. -1 The absorption peak of the monohydrated citric acid monomer is located at 1745.31 cm⁻¹. -1 In Example 1, the absorption band of the conditioned powder was at 1689.44 cm⁻¹. -1 The characteristic peaks show a tendency to shift towards the mid-frequency band and broaden. The shift in the infrared band reflects that after the addition of glycerol and the steam action in the conditioning process, non-covalent hydrogen bond interactions were generated between the components, which changed the initial crystal structure arrangement of the monomers.

[0092] Based on the X-ray diffraction peak counts for crystallization characteristics in Table 1, the powder in Example 1 before conditioning retained 18 diffraction peaks, exhibiting monomeric characteristics. After conditioning, no obvious sharp crystallization characteristic diffraction peaks were observed in the powder of Example 1. This change in data indicates a significant weakening of crystallization characteristics, suggesting that the sample tended to form an amorphous structure under conditioning conditions.

[0093] analyze Figure 1The differential scanning calorimetry (DSC) curves, stacked vertically, show that the solid line (representing the anhydrous betaine monomer) has a major downward endothermic peak at 296.83℃, while the dashed line (representing the monohydrate citric acid monomer) has a major endothermic peak at 102.16℃. In contrast, the dotted line (representing the powder from Example 1 after conditioning) shows a distinct downward endothermic trough at 62.58℃, with the major endothermic transition temperature significantly lower than that of the monomer components, exhibiting eutectic phase transition characteristics. The amorphous hydrogen bond network formed by this eutectic phase transition can embed the introduced γ-aminobutyric acid (GABA). The interaction of the newly formed structure reduces the probability of the embedded molecules becoming free and decreases the probability of direct action of external hydrothermal factors on the embedded molecules, which is beneficial for reducing the damage to easily degradable components during processing.

[0094] Test Example 2:

[0095] Experimental Procedure: Weigh 10.0g of the mixture residue remaining in the granulator after production and 10.0g of the waste material extruded after the passivation and cleaning process in Example 1, and place them separately in two beakers. Add 100mL of deionized water to each beaker and stir continuously at 300rpm for 30 minutes at room temperature using a magnetic stirrer. After standing, filter the solution using medium-speed quantitative filter paper and collect the filtrate. Turn on the pH meter, complete the calibration operation using standard buffer solution, measure the initial pH value of the two sets of filtrates, and record the measurement data.

[0096] Prepare standard carbon steel test pieces made of Q235 material. Polish the surface with graded sandpaper, degrease with anhydrous ethanol, and dry with cold air. Weigh the initial mass using an analytical balance. Suspend the first set of test pieces directly in the granulator cavity containing residual mixture as test pieces for an environment without cleaned residue. Embed the second set of test pieces in the waste extruded from Example 1 as test pieces for an environment with cleaned extrusion waste. Place both sets of test pieces, along with the material, in a constant temperature and humidity chamber at 35°C and 90% relative humidity for 72 hours. After the standing time, remove the test pieces, remove surface adhering substances, ultrasonically clean with rust remover, dry, and weigh again to calculate the corrosion weight loss rate per unit area per unit time.

[0097] After standing for 72 hours, 2 μL of deionized water was added to the surface of both sets of test pieces. The spreading state of the droplets on the metal surface was observed using a contact angle meter, and the contact angle data was recorded. Subsequently, the test pieces were connected to an electrochemical workstation, using a 3.5% sodium chloride aqueous solution as the electrolyte medium and a three-electrode test circuit. The scan rate was set to 1 mV / s, and the test voltage range covered the open circuit potential within 250 mV above and below. The potentiodynamic polarization curves were scanned and recorded, and the corresponding self-corrosion potential data were output.

[0098] Experimental data:

[0099] Table 2. Corrosion resistance test data before and after passivation cleaning process

[0100] Test object pH value of extraction filtrate <![CDATA[Corrosion weight loss rate (g / (m 2 ·h))]]> Self-corrosion potential (mV) Hydrophobic contact angle (°) Environmental test strips with unremoved residue 4.21 2.458 -685.4 - Cleaning extrusion waste environmental test piece 7.42 0.086 -315.7 102.3

[0101] Note: "-" in the table indicates that the surface of the test piece has been oxidized, corroded and roughened before the test, and the water droplets quickly penetrate or spread irregularly after dripping, making it impossible to determine a stable contact angle value.

[0102] Conclusion: According to the data in Table 2, the pH of the leachate from the untreated residue environment was 4.21, indicating an acidic liquid environment. The pH of the leachate from the treated extrusion waste environment was 7.42, indicating a weakly alkaline environment. The changes in pH reflect that the stone powder in the treated formulation, under the mechanical extrusion in the granulation chamber, neutralized the remaining acidic components, reducing the concentration of free hydrogen ions. Regarding the corrosion weight loss rate, the test result for the untreated residue environment was 2.458 g / (m³). 2 The test results for cleaning extrusion waste environmental test specimens (·h) decreased to 0.086 g / (m³). 2 (h). The hydrophobic contact angle of the environmental test piece containing the cleaned extrusion waste was measured to be 102.3°, indicating hydrophobic characteristics. Under the influence of mechanical frictional heat, the soybean oil in the cleaned material spreads into a lipid layer on the metal surface, reducing the probability of water vapor adhering to the metal substrate.

[0103] Combination Figure 2 The electrochemical potentiodynamic polarization curves were analyzed. The horizontal axis represents the logarithm of the current density, and the vertical axis represents the test potential applied to the electrode surface. The V-shaped troughs on the curves correspond to the self-corrosion potential nodes of the metallic materials. The solid line, representing the test piece in the environment with uncleaned residue, is located in the lower left region of the coordinate system, with its trough at -685.4 mV. The dashed line, representing the test piece in the environment with cleaned extrusion waste, shifts to the upper right, with the trough node rising to -315.7 mV, indicating a positive shift in the self-corrosion potential. Within the same potential range, the current density value on the horizontal axis corresponding to the dashed line is lower than that corresponding to the solid line. The positive shift in potential value accompanied by a decrease in current density indicates that the electrochemical reaction kinetics on the metal surface are suppressed. The neutralization reaction reduces the acidic medium that accelerates electron exchange, and the lipid layer coverage increases the resistance to ion cross-interface transport, making it more difficult for electrons to be gained or lost on the metal surface. This helps to mitigate the oxidation corrosion process caused by moisture absorption during long-term shutdown of the equipment.

[0104] Test Example 3:

[0105] Experimental Procedure: Weigh 200.0g of the pre-conditioning powders from Examples 1, 2, 3, and Comparative Example 3. Using a powder property tester, determine and record the initial angle of repose of each sample powder using the injection method. Spread each sample powder evenly in an open petri dish and place it in an artificial climate chamber set at 40℃ and 85% relative humidity for 48 hours. Remove the petri dishes and measure the angle of repose of the powders again after standing. Transfer each powder to a vibrating sieve and continuously sieve for 5 minutes using a 2.0mm sieve. Weigh the mass of the agglomerated material retained above the sieve and calculate its percentage of the total mass; record this as the agglomeration rate.

[0106] The finished granules from Examples 1 to 3, and Comparative Examples 1, 2, and 4 were collected, and the corresponding powders before conditioning and granulation were collected from the same batch. 2.0 g of the pulverized sample was weighed and placed in a centrifuge tube, 25 mL of deionized water was added, and the sample was ultrasonically extracted at room temperature for 30 minutes. The sample was centrifuged at 8000 rpm for 15 minutes, and the supernatant was passed through a 0.22 µm microporous membrane. The filtrate was used to perform pre-column derivatization of GABA using OPA derivatization reagent. 10 μL of the derivatization reaction solution was injected into a high-performance liquid chromatograph (HPLC). Gradient elution was performed using sodium acetate buffer and methanol as the mobile phase at a flow rate of 1.0 mL / min. Chromatographic signals were collected at the corresponding detection wavelength of the derivatized product using a diode array detector, and the retention time and response intensity data were output. The ratio of the absolute content of the target analyte after granulation to the absolute content before granulation was calculated and recorded as the GABA conditioning retention rate.

[0107] Weigh 500.0g of the finished feed pellets from Example 1 and Comparative Example 1. Place the sample in the rotary chamber of the pellet milling rate tester and close the chamber door. Set the rotary chamber speed to 50 revolutions per minute and run continuously for 10 minutes. After the operation, collect all the material in the chamber and pour it into an analytical sieve with a 2.5mm aperture. Manually shake the sieve until no powder leaks through. Weigh the mass of the intact pellets remaining on the sieve and calculate the ratio of this mass to the total mass of the initial sample to obtain the Pellet Durability Index (PDI).

[0108] Experimental data:

[0109] Table 3. Test data on powder flow characteristics, GABA conditioning retention rate and particle forming quality

[0110] Test object Initial angle of repose (°) Angle of repose (°) after resting clumping rate (%) GABA conditioning retention rate (%) Particle Durability Index (PDI) (%) Example 1 35.2 37.5 2.1 92.4 96.8 Example 2 36.1 38.3 2.4 91.1 - Example 3 34.8 36.9 1.8 93.5 - Comparative Example 1 - - - 45.6 85.2 Comparative Example 2 - - - 61.3 - Comparative Example 3 35.5 52.6 18.7 - - Comparative Example 4 - - - 52.8 -

[0111] Note: "-" in the table indicates that the object did not participate in the measurement of the corresponding project and there is no relevant measurement data.

[0112] Conclusion: According to the data in Table 3, the initial angle of repose of the pre-mixed powders in Examples 1 to 3 before conditioning ranged from 34.8° to 36.1°. After standing in a high-humidity environment, the angle of repose increased to the range of 36.9° to 38.3°, with a relatively small increase. The corresponding agglomeration rates were all within 2.4%. In Comparative Example 3, the test object, without silica, achieved an angle of repose of 52.6° and an agglomeration rate of 18.7% after standing. This difference in flowability indicates that the added silica powder helps reduce the formation of liquid bridges on the particle surface after moisture absorption, reduces the probability of capillary transfer of free water between materials, and maintains the discrete state of the powder during transport. In the particle durability test, the PDI value of Example 1 was 96.8%, while the measured value of Comparative Example 1 was 85.2%, reflecting that the coating layer underwent cooling and recrystallization after being removed from the heating environment, filling the voids between the raw materials and increasing the anti-friction mechanical properties of the finished product.

[0113] Combination Figure 3 The high-performance liquid chromatography (HPLC) chromatograms were analyzed. The horizontal axis represents the retention time during elution, and the vertical axis represents the UV absorption response intensity captured by the detector. A characteristic elution peak representing the GABA derivatization product was observed in the 8.5-minute retention time region. The solid line representing Example 1 shows a high characteristic peak height, complete peak shape, and the largest intra-peak area; combined with the data in Table 3, its GABA retention rate is 92.4%. The dotted line representing Comparative Example 1 shows a lower characteristic peak height and smaller peak area, with a retention rate of 45.6%. The dashed line representing Comparative Example 2 and the dotted line representing Comparative Example 4 have characteristic peak heights and areas in the middle range. The correspondence between the peak shape characteristics and the test data reflects that betaine and citric acid, in conjunction with glycerol, transform into an encapsulated form, embedding the GABA molecule and reducing the direct impact of external heat and moisture on the components. Comparative Example 2, due to the change in the order of addition, failed to form in-situ encapsulation, reducing the protective effect; Comparative Example 4, due to the higher conditioning temperature, caused changes in the encapsulation layer structure, resulting in partial thermal degradation of the internal components. The evolution of chromatographic waveform integral area and retention rate data indicates that controlling process parameters and establishing embedding structures are beneficial to improving the retention rate of thermosensitive components during processing.

[0114] Test Example 4:

[0115] Two hundred 21-day-old white-feathered broilers with an initial weight between 750g and 765g were selected. The broilers were randomly assigned to two test groups, each containing 100 birds. The first group was fed the finished pelleted feed prepared in Example 1, and the second group was fed the finished pelleted feed prepared in Comparative Example 1. The test period was 21 days.

[0116] Two groups of broilers were placed in rearing chambers equipped with environmental regulation functions. From 10:00 to 18:00 daily, the ambient temperature inside the chambers was regulated and maintained between 33°C and 35°C, and the relative humidity was set at 75% to 80%. During the remaining time, the temperature was restored to the standard rearing temperature of 24°C to 26°C. Throughout the test period, the broilers were guaranteed free access to feed and water.

[0117] Record the actual feed intake and number of broilers in each group daily. After the test period, weigh the surviving broilers on an empty stomach, calculate the average daily feed intake and feed conversion ratio, and determine the mortality rate.

[0118] On day 21 of the testing period, 10 broilers were randomly selected from each group, and 5 mL of blood samples were collected via the wing vein. After the blood samples were allowed to stand at room temperature, they were centrifuged at 3000 rpm for 10 minutes to separate the serum. The concentration of cortisol in the serum samples was detected using an enzyme-linked immunosorbent assay (ELISA) kit, and the serum superoxide dismutase (SOD) activity and malondialdehyde (MDA) concentration were measured using a biochemical analyzer.

[0119] Experimental data table

[0120] Table 4. Apparent growth and serum biochemical test data of broiler chickens under heat stress

[0121] Feeding objects Average daily feed intake (g / (feather·day)) Meat-to-fat ratio Heat stress mortality rate (%) Serum cortisol concentration (ng / mL) Serum superoxide dismutase activity (U / mL) Serum malondialdehyde concentration (nmol / mL) Example 1 Feed 142.3 1.76 3.0 42.15 158.4 4.12 Comparative Example 1 Feed 128.7 1.94 11.0 68.34 112.7 7.65

[0122] Note: The data in the table are the arithmetic mean of the corresponding indicators for broiler chickens within the group.

[0123] Conclusion: According to the data in Table 4, the average daily feed intake of the test subjects fed with the feed of Example 1 was 142.3 g / (bird·day) during the test period, the feed conversion ratio was 1.76, and the heat stress mortality rate was controlled at 3.0%. The average daily feed intake of the test subjects fed with the feed of Comparative Example 1 decreased to 128.7 g / bird / day, the feed conversion ratio increased to 1.94, and the mortality rate reached 11.0%. In the comparison of blood biochemical indicators, the serum cortisol concentration of the group fed with the feed of Example 1 was 42.15 ng / mL, lower than the 68.34 ng / mL of the group fed with the feed of Comparative Example 1; its superoxide dismutase activity was higher, and its malondialdehyde concentration was lower. The differences between the apparent growth data and the biochemical indicator data indicate that the feed prepared using the formula and processing technology of this invention helps regulate the physiological state of animals under high temperature conditions, reduces the accumulation of lipid peroxidation products, reduces the secretion of stress hormones such as cortisol, and is beneficial to maintaining the energy conversion process for growth.

[0124] The protective mechanism of heat-sensitive components in the preceding process was analyzed by combining the evolution characteristics of biochemical indicators and apparent data. Comparative Example 1 used a conventional pelleting process. The GABA component added to the feed was easily degraded in the conditioning steam environment, affecting the actual dose ingested by the animals and potentially weakening its physiological effect in alleviating heat stress, as shown in Table 4: higher cortisol concentration, reduced feed intake, and increased mortality. Example 1 used a phase change encapsulation process, where GABA was encapsulated in a eutectic amorphous hydrogen bond network formed by betaine-citric acid-glycerol, reducing the damage to the molecular conformation caused by the hydrothermal environment. The GABA retained in the feed may be released after entering the animal's digestive tract and participate in the body's physiological regulation process, potentially helping to alleviate stress responses under heat load conditions and maintain feed intake and antioxidant status. The correlation of the test data indicates that the encapsulation measures in the processing technology have engineering application value in improving the apparent stress resistance of animals.

Claims

1. A stress-resistant and growth-promoting compound feed for poultry, characterized in that, It is made from the following parts by weight of raw materials, based on a total mass of 100 parts: Basic ration module: 96.8-98.1 servings; Stress-resistant phase change core powder: 1.5-2.5 parts; Phase change initiator: 0.3-0.5 parts; Mobile phase separator: 0.1-0.2 parts.

2. The stress-resistant and growth-promoting compound feed for poultry according to claim 1, characterized in that, The stress-resistant phase change core powder is formulated from anhydrous betaine, citric acid monohydrate and γ-aminobutyric acid, and the molar ratio of anhydrous betaine, citric acid monohydrate and γ-aminobutyric acid is 1.0:1.0:(0.15-0.20).

3. The stress-resistant and growth-promoting compound feed for poultry according to claim 1, characterized in that, The basic diet module includes corn, soybean meal, limestone powder, and poultry trace element premix. The corn and soybean meal, after being crushed, are of a particle size that can completely pass through a 2.0mm standard sieve.

4. The stress-resistant and growth-promoting compound feed for poultry according to claim 1, characterized in that, The phase change initiator is feed-grade glycerol, and the mobile phase separator is feed-grade precipitated silica.

5. The stress-resistant and growth-promoting compound feed for poultry according to claim 1, characterized in that, The stress-resistant and growth-promoting poultry compound feed is in pellet form and has a final moisture content of no more than 12.0%.

6. A method for preparing an anti-stress growth-promoting compound feed for poultry, used to prepare the anti-stress growth-promoting compound feed for poultry according to any one of claims 1-5, characterized in that, Includes the following steps: The corn and soybean meal in the basic diet module are dry-crushed using a hammer mill to ensure that the particle size passes through a 2.0mm standard sieve. Then, they are mixed evenly with the stone powder and poultry trace element premix in the basic diet module and set aside. The stress-resistant phase change core powder is put into a premixer for premixing, and the preheated phase change initiator is sprayed onto the surface of the stress-resistant phase change core powder in a dynamic rolling state. After spraying, mechanical stirring is maintained to cause hydrogen bonding on the surface of the anti-stress phase change core powder, resulting in a slightly viscous state. While the anti-stress phase change core powder is in a slightly viscous state, a mobile phase isolating agent is immediately added to the premixer and strongly dispersed and mixed until the anti-stress phase change core powder returns to a loose and free-flowing state, thus obtaining the pre-initiated core powder. The prepared pre-initiated core powder and the prepared basic diet module are put into a bi-shaft paddle mixer for mixing to obtain a preliminary mixed powder. The initial mixed powder is continuously fed into a stainless steel steam conditioner, and saturated steam is introduced to trigger an in-situ eutectic phase transformation. After hydrothermal conditioning, the wet hot powder flows into the ring die pellet mill by gravity and is formed under the extrusion of the pressure rollers. The hot granules are directly fed into the counter-flow cooler for heat exchange along with the chassis, and the moisture content of the final product is reduced to below 12.0%.

7. The method for preparing stress-resistant and growth-promoting compound feed for poultry according to claim 6, characterized in that, The process of premixing the stress-resistant phase change core powder in a premixer, spraying the preheated phase change initiator onto the surface of the stress-resistant phase change core powder in a dynamic tumbling state, and finally strongly dispersing and mixing to obtain the pre-initiated core powder includes: Premix for 1-2 minutes at a spindle speed of 60-80 rpm in the premixer; The phase change initiator is preheated to 35-40°C in a jacketed storage tank; The phase change initiator is sprayed continuously and uniformly over 60-90 seconds with an average droplet size of 50-100µm. The mechanical stirring time after spraying is 2-3 minutes; After adding the mobile phase separator, vigorously disperse and mix at a speed of 1000-1500 rpm for 2-3 minutes.

8. The method for preparing stress-resistant and growth-promoting compound feed for poultry according to claim 6, characterized in that, The process of continuously feeding the pre-mixed powder into a stainless steel steam conditioner and introducing saturated steam to trigger an in-situ eutectic phase transformation specifically includes: Maintain the conditioning temperature at 72-78℃, the output moisture content at 14.5%-15.5%, and control the residence time of the material in the stainless steel steam conditioner to 45-60 seconds.

9. The method for preparing stress-resistant and growth-promoting compound feed for poultry according to claim 8, characterized in that, The process involves the following steps: After hydrothermal conditioning, the wet, hot powder flows by gravity into the ring die pellet mill, where it is shaped under pressure rollers. The hot pellets then enter a counter-flow cooler for heat exchange, ultimately reducing the moisture content of the finished product to below 12.0%. Stainless steel ring dies with a compression ratio of 1:6 to 1:8 are selected; Use room temperature air for ventilation and heat exchange for 10-15 minutes to reduce the temperature of the finished granules to no more than 5°C above the ambient room temperature.

10. The method for preparing stress-resistant and growth-promoting compound feed for poultry according to claim 9, characterized in that, After the production of this batch of feed is completed and the stainless steel steam conditioner is emptied, the steam valve is closed, and the final passivation cleaning material is continuously fed into the stainless steel steam conditioner and the ring die pellet mill. The material is then extruded and discharged at room temperature through the ring die pellet mill. The final passivation cleaning material formula is 95.0% corn husk, 3.0% stone powder, and 2.0% soybean oil.

Images