A formula of special feed for laying hens and a preparation process thereof

Abstract

The present application relates to the technical field of livestock feed, and particularly relates to a special feed formula for layer chickens and a preparation process thereof. According to the physiological development law and the nutritional demand characteristics of layer chickens, the feeding cycle is divided into three stages: the brooding period of 1-21 days, the growth period of 22-49 days, and the fattening period of 50 days to market. The weight percentage composition of the feed formula for each stage is as follows: brooding period feed: corn 55-62%, soybean meal 25-30%, bran 3-5%, fish meal 2-4%, stone powder 1.0-1.3%, calcium hydrogen phosphate 0.8-1.2%, vegetable oil 1.0-1.5%, and salt 0.25-0.35%. The special feed formula for layer chickens and the preparation process thereof scientifically divide the feeding cycle into the brooding period, the growth period, and the fattening period according to the physiological development law of layer chickens, and effectively promote the intestinal development, the maturation of digestive function, and the benign deposition of fat in the later period by differentiating the nutritional demands of each stage, especially the gradient increasing ratio of bran and vegetable oil in the fattening period.

Description

Technical Field

[0001] This invention relates to the field of livestock and poultry feed technology, specifically to a phased-controlled feed formula for general-purpose chickens and its preparation process. Background Technology

[0002] In the raising of common chickens, such as the local Sanhuang chicken and other high-quality broiler breeds, feed formulation and preparation technology are key factors affecting their growth performance, meat flavor, and farming efficiency. Currently, feed products and preparation methods for common chickens mainly suffer from the following technical deficiencies: Current general-purpose chicken feeds mostly adopt a two-stage division scheme from brooding to growth period: 0-21 days old for the brooding period and 22 days old to slaughter for the growth period. There is a lack of specific fattening formulas targeting the peak fat deposition period and critical meat formation period after 50 days of age. The traditional two-stage scheme continues to use growth-stage feed during the fattening period, leading to insufficient energy supply and inadequate fat deposition in the later stages. This not only limits further weight gain at slaughter but also affects the tenderness, juiciness, and flavor of the breast muscle, among other edible quality indicators. Current feed preparation processes typically employ uniform parameters such as particle size, conditioning temperature, and pelleting pore size, failing to consider the differences in feed particle size, digestibility, and retention requirements of heat-sensitive components between chicks and adult chickens at different rearing stages. For example, during the brooding period, fine grinding, high-temperature conditioning, and small-particle-size pelleting are required to improve starch gelatinization and digestibility, while functional components such as enzymes and probiotics added during the fattening period are easily deactivated during high-temperature conditioning. A uniform process struggles to balance the conflict between early-stage digestibility and later-stage functional component activity retention, resulting in generally low enzyme activity retention rates and weakening the actual effectiveness of the formulation design. While some existing technologies attempt to add enzymes or probiotics to feed, these are mostly simple additives without tailoring functional components to the different stages of intestinal development and physiological needs of chickens. Furthermore, they lack corresponding processing technology optimization. This results in significant losses of functional components during processing, insufficient colonization and enzymatic hydrolysis in the animal's body, and limited effectiveness in reducing brooding mortality, improving intestinal health, and increasing feed conversion efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a phased regulation feed formula for general-purpose chickens and its preparation process to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a phased-controlled feed formula for general-purpose chickens, which divides the feeding cycle into three stages according to the physiological development patterns and nutritional requirements of general-purpose chickens: brooding period (1-21 days old), growth period (22-49 days old), and fattening period (50 days old to slaughter); the weight percentage composition of the feed formula for each stage is as follows: Brooding feed: Corn 55-62%, soybean meal 25-30%, wheat bran 3-5%, fish meal 2-4%, limestone 1.0-1.3%, dicalcium phosphate 0.8-1.2%, vegetable oil 1.0-1.5%, salt 0.25-0.35%, lysine 0.2-0.4%, methionine 0.1-0.2%, compound vitamins 0.1-0.2%, compound minerals 0.1-0.2%; Growing season feed: Corn 58-65%, soybean meal 20-25%, wheat bran 5-8%, limestone powder 1.0-1.2%, dicalcium phosphate 0.6-1.0%, vegetable oil 1.5-2.0%, salt 0.25-0.35%, lysine 0.15-0.3%, methionine 0.08-0.15%, compound vitamins 0.1-0.15%, compound minerals 0.1-0.15%; Fattening period feed: corn 60-68%, soybean meal 15-20%, wheat bran 8-12%, limestone powder 0.8-1.1%, dicalcium phosphate 0.4-0.8%, vegetable oil 2.0-2.5%, salt 0.25-0.35%, lysine 0.1-0.2%, methionine 0.05-0.1%, compound vitamins 0.08-0.12%, compound minerals 0.08-0.12%.

[0005] Furthermore, the amount of bran added increases in a gradient across the three stages: 3-5% during the brooding period, 5-8% during the growth period, and 8-12% during the fattening period, in order to gradually promote intestinal development and the maturation of digestive function.

[0006] Furthermore, the amount of vegetable oil added increases in a gradient across the three stages: 1.0-1.5% during the brooding period, 1.5-2.0% during the growth period, and 2.0-2.5% during the fattening period, in order to meet the needs of increased energy density and fat deposition in the later stages.

[0007] Furthermore, the fattening feed also contains 0.1-0.5% of a compound enzyme preparation, which includes xylanase, cellulase and phytase, with an enzyme activity ratio of 2:1:1, to improve the digestibility and utilization of plant-based raw materials.

[0008] Furthermore, the growing feed also contains 0.05-0.1% probiotics, which are a mixture of Bacillus subtilis and lactic acid bacteria, to enhance the intestinal microecological balance and improve disease resistance.

[0009] Furthermore, 0.05-0.1% of probiotics are added to the fattening feed. The probiotics are a mixed bacterial agent of Bacillus subtilis and lactic acid bacteria, which further maintains intestinal health and promotes feed conversion efficiency.

[0010] The present invention also provides a preparation process for the staged regulation feed for general-purpose chickens, comprising the following steps: S1: Based on the particle size requirements of feed at different stages, a differentiated grinding process is adopted: feed ingredients for the brooding period are ground using a 1.5mm sieve, feed ingredients for the growing period are ground using a 2.0mm sieve, and feed ingredients for the fattening period are ground using a 2.5mm sieve. S2: Weigh each raw material according to the weight percentage of the feed formula for each stage, and put them into the mixer to mix until uniform; S3: Put the mixed powder into the conditioner for steam conditioning, using differentiated conditioning temperatures: 75-80℃ for brooding feed, 70-75℃ for growing feed, and 65-70℃ for fattening feed. S4: The conditioned material enters the pellet mill for compression pelleting, using ring dies of different apertures: 2.0mm ring die for brooding feed, 3.0mm ring die for growing feed, and 3.5mm ring die for fattening feed. S5: After granulation, the powder is cooled by a cooler, classified by a vibrating screen to remove powder, and then packaged and stored.

[0011] Furthermore, in S3, the conditioning time is controlled differently according to the stage: 40-60 seconds for the brooding period, 35-50 seconds for the growth period, and 30-45 seconds for the fattening period, in order to balance the starch gelatinization effect and the retention rate of heat-sensitive components.

[0012] Furthermore, in S3, the starch gelatinization degree of the brooding feed reaches more than 40% after conditioning, and the gelatinization degree of the feed during the growth and fattening periods reaches more than 35%, ensuring the digestibility and absorption efficiency at each stage.

[0013] Furthermore, in step S5, the cooling adopts a counter-current cooling method with a cooling time of 10-20 minutes; the screening adopts a double-layer vibrating screen, with the upper screen mesh size being 1.2-1.5 times the granulation ring die mesh size and the lower screen mesh size being 0.6-0.8 times the granulation ring die mesh size, so as to effectively control the particle uniformity and powder content.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This phased-control feed formula and preparation process for regular chickens scientifically divides the feeding cycle into brooding, growth, and fattening periods based on the physiological development patterns of chickens. It addresses the differentiated nutritional needs of each stage, particularly by progressively increasing the ratio of bran to vegetable oil during the fattening period, effectively promoting later-stage intestinal development, digestive function maturation, and healthy fat deposition. Compared to traditional two-stage farming, this three-stage control scheme increases the slaughter weight of chickens, reduces the feed consumption-to-weight gain ratio, and improves the sensory quality and flavor of breast meat.

[0015] 2. This phased regulation of the feed formula and preparation process for general-purpose chickens involves employing differentiated preparation processes for different growth stages. During the brooding period, fine grinding, high-temperature long-time conditioning, and small-particle-size pelleting are used to improve feed digestibility and absorption. During the fattening period, coarse grinding, low-temperature short-time conditioning, and large-particle-size pelleting are used to reduce damage to heat-sensitive components. This process design ensures efficient digestibility and utilization in the brooding stage while effectively protecting the activity of heat-sensitive functional components such as enzymes and probiotics added to the feed during the fattening period.

[0016] 3. This phased regulation of the special feed formula and preparation process for general-purpose chickens, by selectively adding probiotics and compound enzyme preparations to the feed during the growth and fattening periods, combined with differentiated low-temperature conditioning temperature control, maximizes the retention of exogenous beneficial bacteria and enzyme activity. This synergistic optimization strategy improves the intestinal microecological balance of general-purpose chickens, enhances the health of the digestive tract, strengthens the body's disease resistance, and thus effectively reduces the mortality rate during the brooding and growth stages. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart illustrating the stages of raising common chickens according to the present invention. Figure 2 This is a flowchart illustrating the three-stage feed formulation composition of the present invention; Figure 3 This is a flowchart illustrating the use of the functional additives of the present invention. Figure 4 This is a flowchart of the preparation process of the present invention. Detailed Implementation

[0019] The technical solutions of 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.

[0020] In this invention, unless otherwise explicitly specified and limited, the terms installation, connection, linking, fixing, etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Example 1: like Figure 1-4 As shown, this embodiment provides a staged regulation feed formula for general-purpose chickens and its preparation process. The specific weight percentage composition of the feed formula at each stage is as follows: Brooding feed (1-21 days old): The ingredients are: corn 58%, soybean meal 28%, wheat bran 4%, fish meal 3%, limestone powder 1.1%, dicalcium phosphate 1.0%, vegetable oil 1.2%, salt 0.3%, lysine 0.3%, methionine 0.15%, compound vitamins 0.15%, compound minerals 0.15%, and the remainder is filler. Feed for growth period 22-49 days: The ingredients are: corn 62%, soybean meal 22%, wheat bran 6%, limestone powder 1.1%, dicalcium phosphate 0.8%, vegetable oil 1.8%, salt 0.3%, lysine 0.2%, methionine 0.1%, compound vitamins 0.12%, compound minerals 0.12%, probiotics 0.08%, and the remainder is filler. Among them, the probiotic is a mixed bacterial agent of Bacillus subtilis and lactic acid bacteria, with a live bacteria count of 110^9 CFU / g; Fattening period feed from 50 days old to slaughter: The ingredients are: corn 65%, soybean meal 17%, wheat bran 10%, limestone powder 0.9%, dicalcium phosphate 0.6%, vegetable oil 2.2%, salt 0.3%, lysine 0.15%, methionine 0.08%, compound vitamins 0.1%, compound minerals 0.1%, compound enzyme preparations 0.3%, probiotics 0.05%, and the remainder is filler. The compound enzyme preparation contains xylanase, cellulase and phytase, with an enzyme activity ratio of 2:1:1; the probiotic is a mixed bacterial agent of Bacillus subtilis and lactic acid bacteria, with a live bacteria count of 110^9 CFU / g. The preparation process in this embodiment specifically includes the following steps: S1. After removing impurities from bulk raw materials such as corn and soybean meal, differentiated grinding processes are adopted according to the particle size requirements of feed at each stage: feed raw materials for the brooding period are ground using a 1.5mm sieve, feed raw materials for the growing period are ground using a 2.0mm sieve, and feed raw materials for the fattening period are ground using a 2.5mm sieve. S2, accurately weigh each raw material according to the weight percentage of the feed formula for each stage, put them into the mixer and mix thoroughly until uniform, with a mixing uniformity variation coefficient of 7%; S3. The mixed powder is fed into a conditioner for steam conditioning. Different conditioning temperatures are applied based on the heat-sensitive component content and starch gelatinization requirements of the feed at different stages: 78℃ for brooding feed, 73℃ for growing feed, and 68℃ for fattening feed. Conditioning time is controlled differently for each stage: 50 seconds for brooding feed, 45 seconds for growing feed, and 40 seconds for fattening feed. The moisture content of the conditioned material is controlled at 15-18%. Testing shows that the starch gelatinization degree of the brooding feed reaches 42% after conditioning, while the gelatinization degrees of the growing and fattening feeds reach 37% and 36%, respectively. S4. After conditioning, the material enters the pellet mill for compression pelleting. Different ring dies with different apertures are used according to the particle size requirements and feeding characteristics of feed at different stages: 2.0mm ring dies are used for brooding feed, 3.0mm ring dies are used for growing feed, and 3.5mm ring dies are used for fattening feed. After pelleting, the material is cooled to room temperature by a counter-current cooler for 15 minutes. The cooling air temperature is controlled within 5℃ of room temperature to reduce the moisture content of the pellets to below 12%. S5. After cooling, the pelleted feed is graded by a double-layer vibrating screen to remove powder. The upper screen mesh size is 1.2-1.5 times the mesh size of the pelleting ring die, and the lower screen mesh size is 0.6-0.8 times the mesh size of the pelleting ring die. After sieving, the feed is packaged and stored. Example 2: This embodiment is basically the same as Embodiment 1, except that the formula and process parameters are adjusted as follows. Brooding feed: 60% corn, 26% soybean meal, 3% wheat bran, 4% fish meal, 1.2% limestone powder, 1.1% dicalcium phosphate, 1.0% vegetable oil, 0.28% salt, 0.35% lysine, 0.18% methionine, 0.18% compound vitamins, and 0.18% compound minerals; Growing season feed: Corn 58%, soybean meal 25%, wheat bran 8%, limestone powder 1.0%, dicalcium phosphate 1.0%, vegetable oil 1.5%, salt 0.35%, lysine 0.3%, methionine 0.15%, compound vitamins 0.15%, compound minerals 0.15%, probiotics 0.1%; Fattening period feed: corn 68%, soybean meal 15%, wheat bran 8%, limestone powder 1.0%, dicalcium phosphate 0.8%, vegetable oil 2.0%, salt 0.35%, lysine 0.2%, methionine 0.1%, compound vitamins 0.12%, compound minerals 0.12%, compound enzyme preparations 0.5%, probiotics 0.1%; The preparation process of this embodiment specifically includes the following steps. S1 Raw material pretreatment: Same as in Example 1; S2 Ingredient Mixing: Same as in Example 1; S3 conditioning treatment: Conditioning temperature during the brooding period is 75℃, during the growth period it is 70℃, and during the fattening period it is 65℃; conditioning time during the brooding period is 60 seconds, during the growth period it is 50 seconds, and during the fattening period it is 45 seconds. S4 granulation: Same as in Example 1; S5 cooling screening: Same as in Example 1; Example 3: This embodiment is basically the same as Embodiment 1, except that the formula and process parameters are adjusted as follows; Brooding feed: 55% corn, 30% soybean meal, 5% wheat bran, 2% fish meal, 1.3% limestone, 1.2% dicalcium phosphate, 1.5% vegetable oil, 0.35% salt, 0.4% lysine, 0.2% methionine, 0.2% compound vitamins, and 0.2% compound minerals; Growing season feed: 65% corn, 20% soybean meal, 5% wheat bran, 1.2% limestone powder, 0.6% dicalcium phosphate, 2.0% vegetable oil, 0.25% salt, 0.15% lysine, 0.08% methionine, 0.1% compound vitamins, 0.1% compound minerals, and 0.05% probiotics; Fattening period feed: 60% corn, 20% soybean meal, 12% wheat bran, 1.1% limestone powder, 0.4% dicalcium phosphate, 2.5% vegetable oil, 0.25% salt, 0.1% lysine, 0.05% methionine, 0.08% compound vitamins, 0.08% compound minerals, 0.1% compound enzyme preparation, and 0.05% probiotics; The preparation process of this embodiment specifically includes the following steps. S1 Raw material pretreatment: Same as in Example 1; S2 Ingredient Mixing: Same as in Example 1; S3 conditioning treatment: Conditioning temperature during the brooding period is 80℃, during the growth period it is 75℃, and during the fattening period it is 70℃; conditioning time during the brooding period is 40 seconds, during the growth period it is 35 seconds, and during the fattening period it is 30 seconds. S4 granulation: Same as in Example 1; S5 cooling screening: Same as in Example 1; Comparative Example 1: Adopting the existing two-stage scheme The same local Sanhuang chicken breed and breeding conditions as in Example 1 were used, with the difference being: The two-stage division scheme commonly used in the existing technology is adopted, namely, the brooding period from 0 to 21 days old, the growth period from 22 days old to 75 days old for slaughter, and there is no separate fattening period; after 22 days old, the same formula as the growth period in Example 1 is used, without adding enzyme preparations and probiotics. The preparation process in this embodiment adopts uniform process parameters, namely, uniformly using 2.0mm sieve for crushing, uniformly conditioning at 75℃, uniformly granulating with 3.0mm ring die, and other steps are the same as in Example 1; Comparative Example 2: Using uniform process parameters The same three-stage formulation and stage division as in Example 1 were used, the difference being that the preparation process used uniform parameters: In this embodiment, the preparation process uniformly uses a 2.0mm sieve for crushing, uniformly tempers at 75℃, uniformly granulates using a 3.0mm ring die, and other steps are the same as in Example 1; Feeding trials were conducted on a local Sanhuang chicken breed using the feed and processing methods described in Examples 1-3 and Comparative Examples 1-2, with an experimental period of 1-75 days of age. Each example / comparative example had an experimental group with 600 birds per group, for a total of 3000 birds. The groups were randomly assigned, and there was no significant difference in initial body weight among the groups (P>0.05). The breeding and management were carried out according to the conventional breeding operation procedures for local chickens, with free access to feed and water. 1. Test metrics: Record the initial weight, 21-day weight, 49-day weight, and 75-day weight at slaughter for each group of chicks, and calculate the average daily weight gain and feed conversion ratio for each stage; record the number of deaths in each group at each stage, and calculate the mortality rate from 1 to 21 days of age and the overall mortality rate; record the average daily feed intake at each stage; test the xylanase activity retention rate in the compound enzyme preparation after feed pelleting during the fattening period, with the enzyme activity in the raw material powder as a 100% benchmark; after slaughter, breast muscle samples are taken and blind-evaluated by 10 professional tasters, with scoring indicators including tenderness, juiciness, and flavor, with a maximum score of 10 points; 2. The test results are shown in the table below: index Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Weight at 21 days old (g) 512 508 518 505 498 Weight at 49 days old (g) 1520 1495 1535 1480 1465 Slaughter weight at 75 days old (kg) 2.38 2.35 2.41 2.16 2.25 Overall feed-to-meat ratio 2.71:1 2.74:1 2.69:1 2.92:1 2.83:1 Chick mortality rate (%) 2.8 3.0 2.6 4.5 3.6 Overall mortality rate (%) 4.2 4.5 4.0 6.8 5.5 Average daily feed intake during the fattening period (g) 135 132 138 128 131 Enzyme activity retention rate (%) 91 93 90 74 Chest muscle quality rating (out of 10) 8.5 8.3 8.6 7.2 7.8 Comparison table of test results 3. Results Analysis: Compared with Comparative Example 1, the existing two-stage scheme showed that Example 1 had a 10.2% higher slaughter weight (2.38 kg vs 2.16 kg), a 7.2% lower feed conversion ratio (2.71 vs 2.92), a 37.8% lower brooding mortality rate (2.8% vs 4.5%), and an 18.1% higher breast meat quality score (8.5 vs 7.2). The results indicate that the three-stage scheme adopted in this invention, which adds a dedicated fattening period after 50 days of age, better meets the nutritional needs of ordinary chickens during the peak period of fat deposition, significantly improving growth performance and meat flavor. Compared with Comparative Example 2, the slaughter weight of Example 1 was 5.8% higher (2.38 kg vs 2.25 kg), the feed conversion ratio was 4.2% lower (2.71 vs 2.83), the mortality rate during the brooding period was 22.2% lower (2.8% vs 3.6%), and the enzyme activity retention rate was 23.0% higher (91% vs 74%). The results show that the differentiated process parameter scheme adopted in this invention, which combines fine grinding, high-temperature conditioning, and small-particle-size granulation in the early stage, and coarse grinding, low-temperature conditioning, and large-particle-size granulation in the later stage, not only ensures the digestibility and absorption of chicks but also protects the activity of heat-sensitive components during the fattening period, thus achieving synergistic optimization of the formula and process. Comparison between Examples 1-3: Examples 1-3 all achieved better technical effects than the comparative example. Among them, Example 3 had the highest slaughter weight of 2.41 kg, the lowest feed conversion ratio of 2.69:1, and the highest breast muscle quality score of 8.6 points. The differences in various indicators between Examples 1-3 were small, indicating that the formulation range and process parameter range of each stage of the present invention have good feasibility and stability.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the statement "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A staged regulation feed formula for general-purpose chickens, characterized in that: Based on the physiological development patterns and nutritional requirements of common chickens, the rearing cycle is divided into three stages: the brooding period (1-21 days old), the growth period (22-49 days old), and the fattening period (50 days old to slaughter). The weight percentage composition of the feed formula for each stage is as follows: Brooding feed: Corn 55-62%, soybean meal 25-30%, wheat bran 3-5%, fish meal 2-4%, limestone 1.0-1.3%, dicalcium phosphate 0.8-1.2%, vegetable oil 1.0-1.5%, salt 0.25-0.35%, lysine 0.2-0.4%, methionine 0.1-0.2%, compound vitamins 0.1-0.2%, compound minerals 0.1-0.2%; Growing season feed: Corn 58-65%, soybean meal 20-25%, wheat bran 5-8%, limestone powder 1.0-1.2%, dicalcium phosphate 0.6-1.0%, vegetable oil 1.5-2.0%, salt 0.25-0.35%, lysine 0.15-0.3%, methionine 0.08-0.15%, compound vitamins 0.1-0.15%, compound minerals 0.1-0.15%; Fattening period feed: corn 60-68%, soybean meal 15-20%, wheat bran 8-12%, limestone powder 0.8-1.1%, dicalcium phosphate 0.4-0.8%, vegetable oil 2.0-2.5%, salt 0.25-0.35%, lysine 0.1-0.2%, methionine 0.05-0.1%, compound vitamins 0.08-0.12%, compound minerals 0.08-0.12%.

2. The staged regulation feed formula for general-purpose chickens according to claim 1, characterized in that: The amount of bran added increases in a gradient across the three stages: 3-5% during the brooding period, 5-8% during the growth period, and 8-12% during the fattening period.

3. The staged regulation feed formula for general-purpose chickens according to claim 1, characterized in that: The amount of vegetable oil added increases gradually in three stages: 1.0-1.5% during the brooding period, 1.5-2.0% during the growth period, and 2.0-2.5% during the fattening period.

4. The staged regulation feed formula for general-purpose chickens according to claim 1, characterized in that: The fattening feed also contains 0.1-0.5% of a compound enzyme preparation, which includes xylanase, cellulase and phytase, with an enzyme activity ratio of 2:1:

1.

5. The staged regulation feed formula for general-purpose chickens according to claim 1, characterized in that: The growing feed also contains 0.05-0.1% probiotics, which are a mixture of Bacillus subtilis and lactic acid bacteria.

6. The staged regulation feed formula for general-purpose chickens according to claim 1, characterized in that: The fattening feed also contains 0.05-0.1% probiotics, which are a mixed bacterial agent of Bacillus subtilis and lactic acid bacteria.

7. A preparation process for a staged controlled feed for general-purpose chickens as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Based on the particle size requirements of feed at different stages, a differentiated grinding process is adopted: feed ingredients for the brooding period are ground using a 1.5mm sieve, feed ingredients for the growing period are ground using a 2.0mm sieve, and feed ingredients for the fattening period are ground using a 2.5mm sieve. S2, Weigh each raw material according to the weight percentage of the feed formula for each stage, and put them into the mixer to mix until uniform; S3. The mixed powder is put into the conditioner for steam conditioning. Different conditioning temperatures are adopted according to the content of heat-sensitive components and starch gelatinization requirements of feed at different stages: 75-80℃ for brooding feed, 70-75℃ for growing feed, and 65-70℃ for fattening feed. S4. After conditioning, the material enters the pellet mill for compression pelleting. Different ring dies with different apertures are used according to the particle size requirements and feeding characteristics of feed at different stages. 2.0 mm ring dies are used for brooding feed, 3.0 mm ring dies are used for growing feed, and 3.5 mm ring dies are used for fattening feed. S5, after granulation, is cooled by a cooler, then graded by a vibrating screen to remove powder, and finally packaged and stored.

8. The preparation process according to claim 7, characterized in that: In S3, the conditioning time is controlled according to the stage: 40-60 seconds for the brooding period, 35-50 seconds for the growth period, and 30-45 seconds for the fattening period.

9. The preparation process according to claim 7, characterized in that: In S3, the starch gelatinization degree of the brooding feed reaches more than 40% after conditioning, and the gelatinization degree of the feed during the growth and fattening periods reaches more than 35%.

10. The preparation process according to claim 7, characterized in that: In step S5, the cooling adopts a counter-current cooling method, and the cooling time is 10-20 minutes; the screening adopts a double-layer vibrating screen, the aperture of the upper screen is 1.2-1.5 times the aperture of the granulation ring die, and the aperture of the lower screen is 0.6-0.8 times the aperture of the granulation ring die.

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