Pig feed with mildew-proof and quality-guaranteeing characteristics and preparation method thereof

Abstract

The invention relates to the field of pig feed, and discloses a pig feed with mildew-proof and quality-guaranteeing characteristics and a preparation method thereof, the raw materials comprise, by weight, 55-65 parts of corn, 20-28 parts of soybean meal, 2-8 parts of extruded soybean, 1-3 parts of imported fish meal, 2-6 parts of premix, and 3-7 parts of a feed quality-guaranteeing additive. The preparation method comprises the following steps: S1, crushing the corn, the soybean meal and the extruded soybeans for 15-30 minutes, and sieving with a 40-60-mesh sieve; s2, adding the imported fish meal, the premix and the feed quality-guaranteeing additive into the crushed and sieved corn, soybean meal and extruded soybean, and stirring and mixing for 15-35 minutes; s3, the mixture obtained after mixing is subjected to granulation treatment, and granular feed is obtained; s4, the granular feed is dried, the drying temperature is set to be 50-60 DEG C, and drying treatment is conducted for 40-50 min; s5, the dried feed is bagged and packaged, and the packaged feed is placed in a cool and dry place to be stored. The feed additive not only can effectively prevent mildew and prolong the shelf life of the feed, but also can maintain the nutritional value of the feed and improve the breeding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of pig feed, and in particular to a pig feed with mildew-proof and quality-keeping properties and a preparation method thereof. Background Art

[0002] With the continuous expansion of the scale of my country's breeding industry, many problems caused by the breeding industry are becoming increasingly serious. As the saying goes, "diseases come from the mouth", pig feed is a very important link. The cleanliness and hygiene of pig feed are very important for the growth and health of pigs. In modern pig farming, the quality of pig feed directly affects the growth and health of pigs, and thus affects the breeding benefits. However, pig feed is prone to mildew and deterioration during storage and use, which not only reduces the nutritional value of the feed, but also may produce harmful substances, posing a serious threat to the health of pigs and causing huge economic losses to the breeding industry. The main reasons for the mildew and deterioration of pig feed include: high humidity environment, temperature fluctuations, feed ingredients, improper storage conditions, etc. Under high humidity and suitable temperature conditions, mold in the feed can multiply in large numbers, causing the feed to mildew. In addition, the nutrients such as protein and sugar contained in the feed provide a rich food source for the growth of mold. Improper storage conditions, such as poor ventilation and long storage time, can also accelerate the mildew process of the feed. The losses caused by mildew and deterioration of pig feed to my country's breeding industry are mainly manifested in the following aspects: first, it directly leads to feed loss and increases breeding costs; second, the toxins in the moldy feed will affect the growth and development of pigs and reduce breeding efficiency; third, in severe cases, it will cause pigs to be poisoned or even die, causing huge economic losses to farmers. It is estimated that the economic losses caused by mildew and deterioration of pig feed to my country's breeding industry are as high as tens of billions of yuan each year.

[0003] At present, common methods to solve the problem of mildew and deterioration of pig feed include: improving storage conditions, using mildew inhibitors, and using physical methods to treat feed. Improving storage conditions, such as keeping the storage environment dry and ventilated, can effectively reduce the occurrence of mildew. The use of mildew inhibitors can inhibit the growth of mold, but attention should be paid to the selection and dosage of mildew inhibitors to avoid adverse effects on the health of pigs. Physical methods, such as low-temperature storage and irradiation treatment, can also effectively prevent feed from mildewing, but the cost is relatively high. In view of the limitations of existing solutions, it is of great practical significance to develop a pig feed with mildew-proof and shelf-stable properties and a preparation method thereof. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a pig feed with anti-mildew and shelf-life characteristics and a preparation method thereof, which can not only effectively prevent mildew and extend the shelf life of the feed, but also maintain the nutritional value of the feed and improve breeding efficiency.

[0005] The present invention solves the above technical problems by the following technical means: In a first aspect, the present invention discloses a pig feed with anti-mildew and quality preservation properties. The raw materials include, by weight, 55-65 parts of corn, 20-28 parts of soybean meal, 2-8 parts of puffed soybeans, 1-3 parts of imported fish meal, 2-6 parts of premix and 3-7 parts of feed quality preservation additives.

[0006] Preferably, the premix is ​​a mixture of vitamins, trace elements, amino acids, calcium carbonate, calcium hydrogen phosphate and sodium chloride.

[0007] Preferably, the vitamins are formed by mixing vitamin A, vitamin D, vitamin E and vitamin K in a weight ratio of 2:1:3:2, and the trace elements are a mixture of copper, iron, zinc, selenium and magnesium.

[0008] Preferably, the feed quality-preserving additive is a nanoporous material first loaded with proto-ilutane-type sesquiterpene aromatic ester, and then coated with polyethylene glycol.

[0009] Preferably, the preparation method of the feed quality-preserving additive is as follows: A1. Select fresh and mature hazel mushrooms as raw materials, wash and dry them; A2. The hazel mushroom was crushed and then passed through a 70-90 mesh sieve to obtain hazel mushroom powder; A3. The hazel mushroom powder was dissolved in ethyl acetate for ultrasonic extraction, and centrifuged at 7000-9000r / min for 10-20min to obtain a supernatant; A4. purifying the supernatant to obtain a purified supernatant; A5. The nanoporous material was mixed with the purified supernatant, and the mixture was prepared by ultrasonic treatment and vacuum freeze drying; A6. Add the mixture into polyethylene glycol solution, oscillate ultrasonically for 5-10 minutes, evaporate the solution, wash and dry to obtain the feed quality-preserving additive.

[0010] Fresh hazel mushrooms were selected as raw materials, crushed and ultrasonically extracted, and the anti-mold active ingredients were dissolved in ethyl acetate. The supernatant was obtained after centrifugal purification. The supernatant was loaded onto a nanoporous material with a high specific surface area, and the active ingredients were stored and released slowly using the nanopore structure, thereby improving the antioxidant and anti-mold properties. Finally, the nanoparticles were coated with polyethylene glycol (PEG) to form a protective layer, which enhanced their biocompatibility and stability, while preventing the oxidation, photolysis and aggregation of the active ingredients, ensuring their uniform distribution in the feed and lasting anti-mold effect. Nanoporous materials can improve the water solubility of hydrophobic proto-ilutane sesquiterpene aryl esters, thereby improving their absorption and utilization in biological systems, and can improve the uniformity of mixing, prevent the aggregation and precipitation of proto-ilutane sesquiterpene aryl esters during use, and ensure their uniform distribution. Polyethylene glycol coating can effectively protect proto-ilutane sesquiterpene aryl esters from the effects of oxygen, light and heat, thereby extending their service life.

[0011] Preferably, the purification in step A4 comprises one of membrane filtration and column chromatography.

[0012] Preferably, the step of preparing the nanoporous material in step A5 comprises: B1. Add tetraethoxysilane solution to the CTAB solution, slowly stir the solution, control the pH value to 4-6, form a solution, let stand for 24-36h to form a gel, and dry; B2. The dried gel is calcined at 400-600 ° C for 1.5-2.5 hours to form a preliminary nanoporous material; B3. Stir anhydrous toluene and 3-aminopropyltriethoxysilane evenly, add the preliminary nanoporous material, reflux at 80-100° C. for 1-3 hours, filter, wash, and dry to obtain the nanoporous material.

[0013] During the synthesis of nanoporous materials, tetraethoxysilane undergoes hydrolysis and polycondensation in the presence of CTAB to form an ordered silicon-oxygen network structure. Under high temperature conditions, organic solvents and water are removed, while promoting the cross-linking and rearrangement of silicon-oxygen chains to form a stable three-dimensional porous network. This process not only improves the thermal stability and mechanical strength of the material, but also ensures its high specific surface area and porosity. 3-Aminopropyltriethoxysilane reacts with the silicon-oxygen groups on the surface of the nanoporous material to form a modified layer, which improves the functionality of the material, enhances the interaction ability with proto-ilutane-type sesquiterpene aromatic esters, improves its loading capacity and release performance for proto-ilutane-type sesquiterpene aromatic esters, and helps improve biocompatibility.

[0014] In a second aspect, the present invention discloses a method for preparing a pig feed having anti-mildew and quality preservation properties, characterized in that: S1. Grind corn, soybean meal and puffed soybean for 15-30 minutes and pass through a 40-60 mesh sieve; S2. Add imported fish meal, premix and feed quality-preserving additives to the crushed and sieved corn, soybean meal and puffed soybeans, and stir and mix for 15-35 minutes; S3. The mixture obtained after mixing is granulated to obtain a granular feed; S4. Dry the pelletized feed at a temperature of 50-60°C for 40-50 minutes; S5. Divide the dried feed into bags, package them, and store them in a cool and dry place.

[0015] Preferably, during the pelleting process in step S3, the feed particle size is controlled to be 4-6 mm.

[0016] Beneficial effects of the present invention: (1) By utilizing the special properties of nanoporous materials, such as high specific surface area, excellent permeability and controllable release performance, the natural antibacterial agent proto-ilutane sesquiterpene aryl esters can be effectively loaded and stably added to the feed, thereby exerting its role in inhibiting and killing harmful bacteria and significantly extending the shelf life of the feed. By loading on nanoporous materials, proto-ilutane sesquiterpene aryl esters can be slowly released over a long period of time, improving their stability in complex feed environments and enhancing the sustainability and effectiveness of the antibacterial effect. Polyethylene glycol, as a biocompatible polymer, can effectively coat nanoporous materials and provide an additional protective layer to prevent oxidation, photolysis and aggregation of active ingredients, ensuring their uniform distribution in the feed. The presence of polyethylene glycol can also improve the fluidity and palatability of the feed and enhance the digestion and absorption efficiency of animals. At the same time, due to the sustained-release properties of polyethylene glycol, the release rate of the active ingredients is more balanced, reducing the negative impact on the environment and ensuring that the use of feed additives is safer and more sustainable. In summary, the synergistic effect of nanoporous materials and polyethylene glycol not only improves the shelf life of feed, but also optimizes its nutritional value and environmental protection characteristics.

[0017] (2) The pig feed prepared by the present invention is designed and formulated to significantly improve the intestinal microbial ecological balance of pigs and promote the proliferation of beneficial bacteria, thereby comprehensively improving the health status and growth performance of pigs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a feed destructive test diagram of Example 2 of the present invention; The numbers represent the number of days. DETAILED DESCRIPTION

[0019] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention: Example 1

[0020] This embodiment is a method for preparing a pig feed with anti-mildew and quality preservation properties.

[0021] The steps of preparing the nanoporous material include: B1. Add 6.2 L of tetraethoxysilane solution to 4 L of CTAB solution, slowly stir the solution, control the pH value to 4, form a solution, let stand for 24 h to form a gel, and dry; B2. The dried gel was calcined at 400 ° C for 2.5 hours to form a preliminary nanoporous material; B3. 2L of anhydrous toluene and 0.6L of 3-aminopropyltriethoxysilane were stirred evenly, and then the preliminary nanoporous material was added and refluxed at 80°C for 3 hours, filtered, washed, and dried to obtain 6kg of nanoporous material.

[0022] The preparation method of the feed quality-preserving additive is as follows: A1. Select 1.5 kg of fresh and mature hazel mushrooms as raw material, wash and dry them; A2. The hazel mushroom was crushed and then passed through a 70-mesh sieve to obtain hazel mushroom powder; A3. 1.2 kg of hazel mushroom powder was dissolved in 36 L of ethyl acetate for ultrasonic extraction and centrifuged at 7000 r / min for 20 min to obtain the supernatant; A4. Purify the supernatant to obtain 9 L of purified supernatant; A5. 6 kg of nanoporous material was mixed with 9 L of purified supernatant, and the mixture was prepared by ultrasonic treatment and vacuum freeze drying; A6. Add the mixture into 12 L of polyethylene glycol solution, perform ultrasonic oscillation for 5 minutes, evaporate the solution, wash, and dry to obtain a feed quality-preserving additive.

[0023] A pig feed with anti-mold and quality-keeping properties is prepared as follows: S1. 55kg corn, 20kg soybean meal and 2kg puffed soybeans were crushed for 15min and passed through a 40-mesh sieve; S2. Add 1kg of imported fish meal, 2kg of premix and 3kg of feed quality-preserving additive to the crushed and sieved corn, soybean meal and puffed soybean, and stir and mix for 15 minutes; S3. The mixture obtained after mixing was granulated to control the feed particle size to 4 mm to obtain a granular feed; S4. Dry the pelletized feed at a temperature of 50°C for 50 minutes; S5. Divide the dried feed into bags, package them, and store them in a cool and dry place. Example 2

[0024] This embodiment is a method for preparing a pig feed with mildew-proof and quality-preserving properties.

[0025] The steps of preparing the nanoporous material include: B1. Add 6.2 L of tetraethoxysilane solution to 4 L of CTAB solution, slowly stir the solution, control the pH value to 5, form a solution, let stand for 30 h to form a gel, and dry; B2. The dried gel was calcined at 500 ° C for 2 hours to form a preliminary nanoporous material; B3. 2L of anhydrous toluene and 0.6L of 3-aminopropyltriethoxysilane were stirred evenly, and then the preliminary nanoporous material was added and refluxed at 90°C for 2 hours, filtered, washed, and dried to obtain 6kg of nanoporous material.

[0026] The preparation method of the feed quality-preserving additive is as follows: A1. Select 1.5 kg of fresh and mature hazel mushrooms as raw material, wash and dry them; A2. The hazel mushroom was crushed and then sieved through 80 to obtain hazel mushroom powder; A3. 1.2 kg of hazel mushroom powder was dissolved in 36 L of ethyl acetate for ultrasonic extraction and centrifuged at 8000 r / min for 15 min to obtain the supernatant; A4. Purify the supernatant to obtain 9 L of purified supernatant; A5. A mixture of 6 kg of nanoporous material and nano-titanium dioxide in a weight ratio of 1:1 was mixed with 9 L of the purified supernatant, and subjected to ultrasonic treatment and vacuum freeze-drying to obtain a mixture; A6. Add the mixture into 12 L of polyethylene glycol solution, perform ultrasonic oscillation for 7.5 minutes, evaporate the solution, wash, and dry to obtain a feed quality-preserving additive.

[0027] A pig feed with anti-mold and quality-keeping properties is prepared as follows: S1. 60 kg corn, 24 kg soybean meal and 5 kg puffed soybeans were crushed for 22.5 min and passed through a 50-mesh sieve; S2. Add 2kg of imported fish meal, 4kg of premix and 5kg of feed quality-preserving additive to the crushed and sieved corn, soybean meal and puffed soybean, and stir and mix for 25 minutes; S3. The mixture obtained after mixing was granulated to control the feed particle size to 5 mm to obtain a granular feed; S4. Dry the pelletized feed at a temperature of 55°C for 45 minutes; S5. Divide the dried feed into bags, package them, and store them in a cool and dry place. Example 3

[0028] This embodiment is a method for preparing a pig feed with mildew-proof and quality-preserving properties.

[0029] The steps of preparing the nanoporous material include: B1. Add 6.2 L of tetraethoxysilane solution to 4 L of CTAB solution, slowly stir the solution, control the pH value to 4-6, form a solution, let stand for 24-36 h to form a gel, and dry; B2. The dried gel was calcined at 600°C for 1.5 hours to form a preliminary nanoporous material; B3. 2L of anhydrous toluene and 0.6L of 3-aminopropyltriethoxysilane were stirred evenly, and then the preliminary nanoporous material was added to reflux at 100°C for 1 hour, filtered, washed, and dried to obtain 6kg of nanoporous material.

[0030] The preparation method of the feed quality-preserving additive is as follows: A1. Select 1.5 kg of fresh and mature hazel mushrooms as raw material, wash and dry them; A2. The hazel mushroom was crushed and then passed through a 90-mesh sieve to obtain hazel mushroom powder; A3. 1.2 kg of hazel mushroom powder was dissolved in 36 L of ethyl acetate for ultrasonic extraction and centrifuged at 9000 r / min for 10 min to obtain the supernatant; A4. Purify the supernatant to obtain 9 L of purified supernatant; A5. 6 kg of nanoporous material was mixed with 9 L of purified supernatant, and the mixture was prepared by ultrasonic treatment and vacuum freeze drying; A6. Add the mixture into 12 L of polyethylene glycol solution, oscillate ultrasonically for 10 minutes, evaporate the solution, wash, and dry to obtain a feed quality-preserving additive.

[0031] A pig feed with anti-mold and quality-keeping properties is prepared as follows: S1. 65kg corn, 28kg soybean meal and 8kg puffed soybeans were crushed for 30min and passed through a 60-mesh sieve; S2. Add 3kg of imported fish meal, 6kg of premix and 7kg of feed quality-preserving additive to the crushed and sieved corn, soybean meal and puffed soybean, and stir and mix for 35 minutes; S3. The mixture obtained after mixing was granulated to control the feed particle size to 6 mm to obtain a granular feed; S4. Dry the pelletized feed at 60°C for 40 minutes; S5. Divide the dried feed into bags, package them, and store them in a cool and dry place.

[0032] Comparative Example 1 This embodiment is different from Embodiment 2 in that the feed quality-preserving additive is replaced with hazel mushroom.

[0033] Comparative Example 2 This embodiment is different from Embodiment 2 in that the nanoporous material is replaced with ordinary silicon dioxide.

[0034] Comparative Example 3 This embodiment is different from Embodiment 2 in that the feed quality-preserving additive is not coated with polyethylene glycol.

[0035] Feed destructive test 100 g of the feeds of Examples 1-3 and Comparative Examples 1-3 were weighed and placed in a sterile tray and stirred thoroughly. That is, the feed samples were stored in a relatively high temperature (25-30° C.) and humidity (75%-78%) environment, and the time for the feed to mildly mold was multiplied by 6 to predict the shelf life of the feed under normal storage conditions.

[0036] The specific method is: place a small plastic cup containing 45 mL of water in the middle of a 1 L PVC plastic cup, evenly place 100 g of feed sample in the large cup, the feed height is half the height of the small cup, then seal the large cup and place it in a 37°C constant temperature box for cultivation, observe and record the colony growth every day. The moldy grade of feed is determined according to the growth of mold colonies, which is divided into 5 levels: no mold (no mold growth on the surface), mild mold (a small amount of mold growth on the edge of the surface), moderate mold (a small amount of scattered mold on the surface), severe mold (the surface is basically covered with mold), and complete mold (dense mold growth on the surface). The shelf life is predicted based on the time of mild mold.

[0037] This experiment predicts the shelf life of feed under normal storage conditions by increasing temperature and humidity and multiplying the time for mild mold to occur in the feed by 6. Figure 1 is a feed destructive test diagram of Example 2 of the present invention, Figure 1 It can be seen that the mixed feed of Example 2 began to mildly mold on the ninth day, from which it can be calculated that the shelf life of the mixed feed of Example 2 under normal storage conditions is 54 days. The shelf life of other examples is shown in Table 1 Table 1 Storage period

[0038] It can be seen from the data of Example 2 and Comparative Examples 1-3 that the mildew-proof pig feed using Example 2 has a good mildew-proof effect. Comparative Example 1 directly uses hazel mushrooms. Due to the lack of protection for the active ingredients, the antibacterial ingredients are easily affected by environmental factors such as oxygen and humidity, resulting in rapid degradation of the active ingredients. This will make the mildew-proof effect not lasting, the mildew-proof effect of the feed is weak, and it is difficult to extend the shelf life of the feed. Comparative Example 2 uses ordinary silica, and the pore structure and specific surface area are relatively small, resulting in limited loading and release control effects of the active ingredients, and it is difficult to achieve stable and slow release. Therefore, in terms of mildew-proof effect, it is difficult to achieve a more ideal persistence, and the effect is not as significant as when the nanoporous material is loaded. Comparative Example 3 does not use polyethylene glycol, and the active ingredients are easily affected by oxygen and humidity in the feed, which may cause the active ingredients to be released too quickly and reduce their stability. At the same time, not using PEG will also result in poor dispersibility of the active ingredients in the feed, easy aggregation, affecting the uniform release of the antibacterial agent and the overall mildew-proof effect of the feed.

[0039] Determination of moisture content in feed Refer to GB / T 6435-2006 Determination of moisture and other volatile substances in feed.

[0040] Table 2 Effects on feed moisture content

[0041] The moisture content of pig feed has a significant impact on its shelf life. The ideal moisture content of pig feed should be controlled below 12%. Excessive moisture content will provide a good environment for the growth of microorganisms, especially mold and bacteria. The growth of these microorganisms will accelerate the mildew and deterioration of the feed, thereby significantly shortening the shelf life of the feed. In addition, high moisture content will also cause the nutrients in the feed to decompose and reduce the nutritional value of the feed. Therefore, controlling the moisture content of pig feed and taking appropriate drying and storage measures are crucial to extending the shelf life of the feed, maintaining the nutritional value of the feed and ensuring the breeding benefits. As shown in Table 1, the addition of feed quality-preserving additives reduces the moisture content of the feed and extends the shelf life of the feed.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A pig feed with mildew-proof and quality-preserving properties, characterized in that: The raw materials include, by weight, 55-65 parts of corn, 20-28 parts of soybean meal, 2-8 parts of puffed soybeans, 1-3 parts of imported fish meal, 2-6 parts of premix and 3-7 parts of feed quality-preserving additives.

2. The pig feed with mildew-proof and quality-keeping properties according to claim 1, characterized in that: The premix is ​​a mixture of vitamins, trace elements, amino acids, calcium carbonate, calcium hydrogen phosphate and sodium chloride.

3. The pig feed with mildew-proof and quality-keeping properties according to claim 2, characterized in that: The vitamins are formed by mixing vitamin A, vitamin D, vitamin E and vitamin K in a weight ratio of 2:1:3:2, and the trace elements are a mixture of copper, iron, zinc, selenium and magnesium.

4. The pig feed with mildew-proof and quality-preserving properties according to claim 1, characterized in that: The feed quality-preserving additive is prepared by firstly loading the proto-ilutane type sesquiterpene aryl ester on a nanoporous material and then coating it with polyethylene glycol.

5. The pig feed with mildew-proof and quality-preserving properties according to claim 4, characterized in that: The preparation method of the feed quality-preserving additive is as follows: A1. Select fresh and mature hazel mushrooms as raw materials, wash and dry them; A2. The hazel mushroom was crushed and then passed through a 70-90 mesh sieve to obtain hazel mushroom powder; A3. The hazel mushroom powder was dissolved in ethyl acetate for ultrasonic extraction, and centrifuged at 7000-9000r / min for 10-20min to obtain a supernatant; A4. purifying the supernatant to obtain a purified supernatant; A5. The nanoporous material was mixed with the purified supernatant, and the mixture was prepared by ultrasonic treatment and vacuum freeze drying; A6. Add the mixture into polyethylene glycol solution, oscillate ultrasonically for 5-10 minutes, evaporate the solution, wash and dry to obtain the feed quality-preserving additive.

6. The pig feed with mildew-proof and quality-preserving properties according to claim 5, characterized in that: The purification in step A4 comprises one of membrane filtration and column chromatography.

7. The pig feed with mildew-proof and quality-preserving properties according to claim 5, characterized in that: The steps of preparing the nanoporous material in step A5 include: B1. Add tetraethoxysilane solution to the CTAB solution, slowly stir the solution, control the pH value to 4-6, form a solution, let stand for 24-36h to form a gel, and dry; B2. The dried gel is calcined at 400-600 ° C for 1.5-2.5 hours to form a preliminary nanoporous material; B3. Stir anhydrous toluene and 3-aminopropyltriethoxysilane evenly, add the preliminary nanoporous material, reflux at 80-100° C. for 1-3 hours, filter, wash, and dry to obtain the nanoporous material.

8. A method for preparing a pig feed with mildew-proof and quality-preserving properties as claimed in claim 1, characterized in that: S1. Grind corn, soybean meal and puffed soybean for 15-30 minutes and pass through a 40-60 mesh sieve; S2. Add imported fish meal, premix and feed quality-preserving additives to the crushed and sieved corn, soybean meal and puffed soybeans, and stir and mix for 15-35 minutes; S3. The mixture obtained after mixing is granulated to obtain a granular feed; S4. Dry the pelletized feed at a temperature of 50-60°C for 40-50 minutes; S5. Divide the dried feed into bags, package them, and store them in a cool and dry place.

9. The method for preparing a pig feed with mildew-proof and quality-keeping properties according to claim 8, characterized in that: During the pelleting process in step S3, the feed particle size is controlled to be 4-6 mm.

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