Preparation process of fattening pig feed

Abstract

This invention discloses a preparation process for fattening pig feed, belonging to the field of feed preparation technology. The feed ingredients are: 30-45 parts corn flour, 25-38 parts wheat bran, 10-12 parts pine needle powder, 9-15 parts bone, 6-10 parts pigskin, 3-6 parts seaweed powder, 3-6 parts traditional Chinese medicine composition, 5-10 parts shiitake mushroom root, 0.1-0.2 parts polyglycerol fatty acid ester, 0.2-0.3 parts yeast selenium, 3-6 parts chitosan, and 0.4-0.5 parts salt. This application optimizes the feed formula and improves the preparation process, resulting in a feed that is nutritionally complete, with minimal loss of drug and nutrient components, and is easily absorbed, greatly enhancing the disease resistance of piglets.

Description

Technical Field

[0001] This invention relates to the field of feed technology, and in particular to a preparation process for fattening pig feed. Background Technology

[0002] With the large-scale development of modern pig farming, adding trace elements and chemical drugs to pig feed to promote piglet growth and reduce disease can be effective to some extent. However, adding drugs to feed can easily lead to drug residues, which can harm human health. Current technologies for adding traditional Chinese medicine ingredients to feed offer advantages such as safety, low toxicity, no residues, and no drug resistance.

[0003] Chinese Patent Publication No. CN107788239A discloses a nutritional feed for piglets and its preparation method, which is formulated from the following raw materials in parts by weight: 24-41 parts of dried rice straw powder, 17-20 parts of arrowhead powder, 20-24 parts of dried chicken manure, 7-9 parts of brewer's yeast, 8-11 parts of wheat bran, 1-2 parts of pig hair powder, 0.8-1.2 parts of mussel powder, 1.0-1.8 parts of amino acids, 1-2 parts of calcium dihydrogen phosphate, 1.2-2.0 parts of minerals, and 2-3 parts of traditional Chinese medicine powder; the raw materials of the traditional Chinese medicine powder are formulated from the following raw materials in parts by weight: 0.5-0.7 parts of Atractylodes macrocephala, 0.2-0.4 parts of licorice, 0.3-0.5 parts of malt, 0.4-0.6 parts of germinated rice, 0.3-0.4 parts of Astragalus membranaceus powder, and 0.3-0.4 parts of Polygonatum odoratum powder. Compared to existing technologies, this invention is formulated according to the nutritional needs of piglets, providing a nutrient-rich, hormone-free, and chemical-residue-free feed that promotes feeding and digestion. However, this invention involves directly pulverizing traditional Chinese medicine ingredients and mixing them with other substances to create feed, making it difficult for the piglets to fully absorb the medicine after it enters their bodies.

[0004] Chinese Patent Publication No. CN107712436A discloses a traditional Chinese medicine feed for improving poultry immunity and its preparation method. The feed consists of grains, limestone powder, vegetable oil, traditional Chinese medicinal herbs, amino acids, preservatives, grasses, salt, and probiotics. The preparation method includes weighing, boiling, concentrating, drying, and mixing. This invention regulates poultry by rationally combining the raw materials, especially the synergistic effect between the traditional Chinese medicinal herbs, thereby improving their disease resistance and immunity. It also improves the digestive system, enhancing spleen and stomach function, preventing weight loss and tender meat caused by digestive issues, increasing appetite and feed intake, promoting growth, and strengthening the constitution of poultry, thus achieving regulatory effects and improving their immunity. However, the traditional Chinese medicinal herbs in this invention are first extracted, then spray-dried, and mixed with other ingredients, resulting in significant loss of effective components. Summary of the Invention

[0005] In view of this, the purpose of this invention is to address the shortcomings of the prior art by providing a preparation process for fattening pig feed. By optimizing the feed formula and improving the preparation process, the prepared feed is nutritionally complete, with minimal loss of drug and nutrient components, and is easily absorbed, which can greatly enhance the disease resistance of piglets.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A process for preparing fattening pig feed includes the following steps:

[0008] (1) Ingredients: 30-45 parts corn flour, 25-38 parts wheat bran, 10-12 parts pine needle powder, 9-15 parts bone, 6-10 parts pig skin, 3-6 parts seaweed powder, 3-6 parts traditional Chinese medicine composition, 5-10 parts shiitake mushroom root, 0.1-0.2 parts polyglycerol fatty acid ester, 0.2-0.3 parts yeast selenium, 3-6 parts chitosan and 0.4-0.5 parts salt;

[0009] (2) After pulverizing the Chinese herbal medicine composition, add 4-6 times the amount of water and soak for 2 hours, then extract. After extraction, filter to obtain the medicinal liquid and residue. Concentrate the medicinal liquid to one-third of the original volume to obtain concentrated medicinal liquid.

[0010] (3) Break fresh bones into pieces 1-3cm in length, cut fresh pig skin into 1-3cm cubes, put them into a steam explosion device, maintain a steam pressure of 3-4.5Mpa for 150-200s, and then release the pressure instantly to obtain bone powder collagen soup.

[0011] (4) Add polyglycerol fatty acid ester and chitosan to the concentrated drug solution, then mix with bone meal collagen soup, freeze dry to obtain a mixture;

[0012] (5) Crush the shiitake mushroom root, mix it evenly with the medicinal residue, corn flour, wheat bran and pine needle powder, add 1-2 times the weight of water, inoculate with compound bacteria, and ferment at 30-35℃ for 6-8 days to obtain the fermentation product;

[0013] (6) Mix the fermentation product with the mixture, seaweed powder, yeast selenium and salt evenly, dry and crush into particles with a particle size of 1.5-2mm to obtain feed.

[0014] Furthermore, the traditional Chinese medicine composition in step (1) is made by mixing the following raw materials in parts by weight: 20-30 parts of Codonopsis pilosula, 20-30 parts of Astragalus membranaceus, 20-30 parts of Nelumbo nucifera, 15-20 parts of Dryopteris crassirhizoma, 15-20 parts of Taraxacum mongolicum, 15-20 parts of Phellodendron chinense, 15-20 parts of Dioscorea opposita, 15-20 parts of Atractylodes macrocephala, 15-20 parts of Crataegus pinnatifida, and 8-12 parts of Glycyrrhiza uralensis.

[0015] Furthermore, the compound bacterial strain in step (5) is a mixture of Bacillus subtilis and Lactobacillus plantarum in a weight ratio of 1:2, with an inoculation amount of 0.3-0.6 wt%.

[0016] Furthermore, after the fermentation product in step (6) is evenly mixed with the mixture, seaweed powder, yeast selenium and salt, it is placed on a mesh screen and fumigated with 5 times the weight of mugwort water. After the mugwort water is evaporated, it is dried and pulverized.

[0017] Furthermore, the extraction process in step (2) is as follows: maintain pressure at 100-150 MPa for 1-2 minutes, then quickly depressurize to 5-8 MPa, continue to maintain pressure for 6-8 minutes, and then depressurize to normal pressure.

[0018] Furthermore, in step (1), the bone refers to cow bone, pig bone, or fish bone.

[0019] The beneficial effects of this invention are:

[0020] 1. This invention discloses a preparation process for fattening pig feed. By optimizing the feed formula and improving the preparation process, the prepared feed is nutritionally complete, easily absorbed, and can greatly enhance the disease resistance of piglets.

[0021] 2. The feed of this application contains a traditional Chinese medicine composition, in which Codonopsis pilosula, Astragalus membranaceus, and lotus seeds are the principal herbs, which tonify the middle energizer, invigorate the spleen and lungs, and increase immunity; Dryopteris crassirhizoma, Taraxacum mongolicum, and Phellodendron chinense are the assistant herbs, which can clear heat and detoxify, inhibit bacteria, and enhance disease resistance; Dioscorea opposita, Atractylodes macrocephala, and Crataegus pinnatifida are the adjuvant herbs, which can invigorate the spleen and stomach, promote digestion, and enhance intestinal absorption. This traditional Chinese medicine composition can improve the disease resistance of piglets, enhance their physical condition, and increase the absorption and metabolism of food, thereby improving the quality of pork.

[0022] 3. The feed also contains pine needle powder, bones, pig skin, shiitake mushroom stems, polyglycerol fatty acid esters, chitosan, seaweed powder, and yeast selenium. Pine needle powder contains a large amount of trace elements, such as potassium, calcium, magnesium, and vitamins. Seaweed powder also contains a large amount of protein, amino acids, carbohydrates, vitamins, and minerals, which can improve the nutritional structure of the feed, enhance immunity, strengthen bones, improve physical strength and endurance, and promote growth. Bones and pig skin contain a large amount of protein, and bones are rich in calcium. Yeast selenium can also improve the immunity of piglets. Therefore, the ingredients in this invention are reasonably combined, providing balanced and comprehensive nutrition, which is beneficial to the healthy growth of piglets.

[0023] 4. In order to improve the extraction rate of effective components in traditional Chinese medicine compositions and minimize the loss of effective components, this invention maintains high pressure for 1-2 minutes. The short extraction time under high pressure can minimize the loss of effective components. Then, the pressure is quickly released to 5-8 MPa. Under the action of pressure difference, the cell walls and cell membranes of traditional Chinese medicine are destroyed, and the effective components are dissolved. Then, extraction is continued at this pressure for 6-8 minutes, and the pressure is released to normal pressure for further extraction of effective components. This method has minimal loss of effective components. Moreover, after the ultra-high pressure treatment, the tissue of the residue is destroyed, cellulose and lignin are separated, and polysaccharides and other components are dissolved, which is beneficial to digestion and absorption.

[0024] To improve the utilization rate of medicinal residue, this application further ferments the medicinal residue, shiitake mushroom roots, corn flour, and wheat bran in the later stages. The fermentation strain is a compound strain of Bacillus subtilis and Lactobacillus plantarum, and the shiitake mushroom roots are also used as a strain for co-fermentation with Bacillus subtilis and Lactobacillus plantarum. This can further promote the dissolution of effective components in the medicinal residue, increase the dissolution of protein and polysaccharides in the medicinal residue and wheat bran, improve feed utilization, and promote the growth and development of piglets.

[0025] 5. This application involves steam-explosion treatment of bones and pigskin. Under high-pressure steam, the triple helix structure of collagen molecules in the pigskin loosens, peptide chains break, forming water-soluble gelatin, and some proteins hydrolyze into amino acids. The bone tissue explodes instantaneously, greatly increasing its specific surface area and forming bone meal collagen soup. Polyglycerol fatty acid esters and chitosan are added to the concentrated drug solution. After homogenization, some of the active ingredients in the concentrated drug solution are encapsulated in chitosan, while the unencapsulated portion is adsorbed into the broken bone tissue, greatly reducing the loss of active ingredients during feed storage.

[0026] 6. The feed prepared in this application is fumigated with mugwort water before pelleting. The purpose is to sterilize it, and the volatile components in mugwort will be adsorbed on the surface of the feed, playing an antibacterial and anti-inflammatory role. On the other hand, it can improve the taste of the feed. Detailed Implementation

[0027] The present invention will be further described below with reference to specific embodiments. Example

[0028] A process for preparing fattening pig feed includes the following steps:

[0029] (1) Ingredients: 30 parts corn flour, 38 parts wheat bran, 10 parts pine needle powder, 9 parts bone, 10 parts pig skin, 3 parts seaweed powder, 3 parts traditional Chinese medicine composition, 10 parts shiitake mushroom root, 0.1 parts polyglycerol fatty acid ester, 0.3 parts yeast selenium, 3 parts chitosan and 0.4 parts salt;

[0030] (2) After pulverizing the Chinese herbal medicine composition to 200 mesh, add 4 times the amount of water and soak for 2 hours, then extract. The specific extraction process is: maintain pressure at 100 MPa for 2 minutes, then quickly release pressure to 5 MPa, continue to maintain pressure for 8 minutes, then release pressure to normal pressure, then filter to obtain the medicine liquid and medicine residue, concentrate the medicine liquid to one-third of the original volume to obtain concentrated medicine liquid;

[0031] (3) Break fresh bones into pieces 1-3cm in length, cut fresh pig skin into 1-3cm cubes, put them into a steam explosion device, maintain a steam pressure of 3Mpa for 200s, and then release the pressure instantly to obtain bone powder collagen soup.

[0032] (4) Add polyglycerol fatty acid ester and chitosan to the concentrated drug solution, homogenize and mix with bone meal collagen soup, freeze dry at -20℃ to obtain a mixture;

[0033] (5) Crush the shiitake mushroom root, mix it evenly with the medicinal residue, corn flour, wheat bran and pine needle powder, add water of 1 weight, inoculate with 0.3wt% compound bacteria, ferment at 30-35℃ for 6 days; and obtain the fermentation product.

[0034] (6) Mix the fermentation product with the mixture, seaweed powder, yeast selenium and salt, etc. evenly, dry and crush into particles with a particle size of 1.5-2mm to obtain feed.

[0035] The traditional Chinese medicine composition in step (1) is made by mixing the following raw materials in parts by weight: 20 parts of Codonopsis pilosula, 20 parts of Astragalus membranaceus, 30 parts of Nelumbo nucifera, 15 parts of Dryopteris crassirhizoma, 15 parts of Taraxacum mongolicum, 20 parts of Phellodendron chinense, 20 parts of Dioscorea opposita, 15 parts of Atractylodes macrocephala, 15 parts of Crataegus pinnatifida and 8 parts of Glycyrrhiza uralensis; the bone refers to bovine bone.

[0036] Step (5) The compound bacterial strain is a mixture of Bacillus subtilis and Lactobacillus plantarum in a weight ratio of 1:2. Example

[0037] A process for preparing fattening pig feed includes the following steps:

[0038] (1) Ingredients: 32 parts corn flour, 35 parts wheat bran, 10.5 parts pine needle powder, 11 parts bone, 9 parts pig skin, 4 parts seaweed powder, 4 parts traditional Chinese medicine composition, 8 parts shiitake mushroom root, 0.12 parts polyglycerol fatty acid ester, 0.28 parts yeast selenium, 4 parts chitosan and 0.42 parts salt;

[0039] (2) After pulverizing the Chinese herbal composition, add 5 times the amount of water and soak for 2 hours, then extract. The specific extraction process is as follows: maintain pressure at 120 MPa for 1.5 minutes, then quickly release pressure to 6 MPa, continue to maintain pressure for 7.5 minutes, then release pressure to normal pressure, then filter to obtain the medicinal liquid and residue, and concentrate the medicinal liquid to one-third of the original volume to obtain concentrated medicinal liquid.

[0040] (3) Break fresh bones into pieces 1-3cm in length, cut fresh pig skin into 1-3cm cubes, put them into a steam explosion device, maintain a steam pressure of 3.2Mpa for 180s, and then release the pressure instantly to obtain bone powder collagen soup.

[0041] (4) Add polyglycerol fatty acid ester and chitosan to the concentrated drug solution, homogenize and mix with bone meal collagen soup, freeze dry to obtain a mixture;

[0042] (5) Crush the shiitake mushroom root, mix it evenly with the medicinal residue, corn flour, wheat bran and pine needle powder, add 1.5 times the weight of water, inoculate with 0.4wt% compound bacteria, ferment at 30-35℃ for 7 days; and obtain the fermentation product.

[0043] (6) Mix the fermentation product with the mixture, seaweed powder, yeast selenium and salt evenly, place it on a mesh screen, and fumigate with 5 times the weight of mugwort water (0.3g mugwort / 1L water). After the mugwort water is evaporated, dry it and crush it into particles with a particle size of 1.5-2mm to obtain the feed.

[0044] The traditional Chinese medicine composition in step (1) is made by mixing the following raw materials in parts by weight: 22 parts of Codonopsis pilosula, 22 parts of Astragalus membranaceus, 28 parts of Nelumbo nucifera, 16 parts of Dryopteris crassirhizoma, 16 parts of Taraxacum mongolicum, 19 parts of Phellodendron chinense, 18 parts of Dioscorea opposita, 16 parts of Atractylodes macrocephala, 16 parts of Crataegus pinnatifida and 9 parts of Glycyrrhiza uralensis; the bones refer to pig bones.

[0045] Step (5) The compound bacterial strain is a mixture of Bacillus subtilis and Lactobacillus plantarum in a weight ratio of 1:2. Example

[0046] A process for preparing fattening pig feed includes the following steps:

[0047] (1) Ingredients: 35 parts corn flour, 30 parts wheat bran, 11 parts pine needle powder, 12 parts bone, 8 parts pig skin, 5 parts seaweed powder, 5 parts traditional Chinese medicine composition, 7 parts shiitake mushroom root, 0.15 parts polyglycerol fatty acid ester, 0.25 parts yeast selenium, 5 parts chitosan and 0.45 parts salt;

[0048] (2) After pulverizing the Chinese herbal composition, add 5 times the amount of water and soak for 2 hours, then extract. The specific extraction process is as follows: maintain pressure at 130 MPa for 1.5 minutes, then quickly release pressure to 7 MPa, continue to maintain pressure for 7 minutes, then release pressure to normal pressure, then filter to obtain the medicinal liquid and residue, and concentrate the medicinal liquid to one-third of the original volume to obtain concentrated medicinal liquid.

[0049] (3) Break fresh bones into pieces 1-3cm in length, cut fresh pig skin into 1-3cm cubes, put them into a steam explosion device, maintain a steam pressure of 3.5Mpa for 160s, and then release the pressure instantly to obtain bone powder collagen soup.

[0050] (4) Add polyglycerol fatty acid ester and chitosan to the concentrated drug solution, homogenize and mix with bone meal collagen soup, freeze dry to obtain a mixture;

[0051] (5) Crush the shiitake mushroom root, mix it evenly with the medicinal residue, corn flour, wheat bran and pine needle powder, add 1.5 times the weight of water, inoculate with 0.5wt% compound bacteria, ferment at 30-35℃ for 8 days; and obtain the fermentation product.

[0052] (6) Mix the fermentation product with the mixture, seaweed powder, yeast selenium and salt evenly, place it on a mesh screen, and fumigate with 5 times the weight of mugwort water (0.3g mugwort / 1L water). After the mugwort water is evaporated, dry it and crush it into particles with a particle size of 1.5-2mm to obtain the feed.

[0053] The traditional Chinese medicine composition in step (1) is made by mixing the following raw materials in parts by weight: 25 parts of Codonopsis pilosula, 25 parts of Astragalus membranaceus, 25 parts of Nelumbo nucifera, 18 parts of Dryopteris crassirhizoma, 18 parts of Taraxacum mongolicum, 18 parts of Phellodendron chinense, 17 parts of Dioscorea opposita, 17 parts of Atractylodes macrocephala, 17 parts of Crataegus pinnatifida and 10 parts of Glycyrrhiza uralensis; the bone refers to fish bone.

[0054] Step (5) The compound bacterial strain is a mixture of Bacillus subtilis and Lactobacillus plantarum in a weight ratio of 1:2. Example

[0055] A process for preparing fattening pig feed includes the following steps:

[0056] (1) Ingredients: 40 parts corn flour, 28 parts wheat bran, 11.5 parts pine needle powder, 14 parts bone, 67 parts pig skin, 6 parts seaweed powder, 6 parts traditional Chinese medicine composition, 6 parts shiitake mushroom root, 0.18 parts polyglycerol fatty acid ester, 0.22 parts yeast selenium, 6 parts chitosan and 0.48 parts salt;

[0057] (2) After pulverizing the Chinese herbal composition, add 6 times the amount of water and soak for 2 hours, then extract. The specific extraction process is as follows: maintain pressure at 140 MPa for 1.5 minutes, then quickly release pressure to 8 MPa, continue to maintain pressure for 6.5 minutes, then release pressure to normal pressure, then filter to obtain the liquid and residue, and concentrate the liquid to one-third of the original volume to obtain the concentrated liquid.

[0058] (3) Break fresh bones into pieces 1-3cm in length, cut fresh pig skin into 1-3cm cubes, put them into a steam explosion device, maintain a steam pressure of 4Mpa for 150s, and then release the pressure instantly to obtain bone powder collagen soup.

[0059] (4) Add polyglycerol fatty acid ester and chitosan to the concentrated drug solution, homogenize and mix with bone meal collagen soup, freeze dry to obtain a mixture;

[0060] (5) Crush the shiitake mushroom root, mix it evenly with the medicinal residue, corn flour, wheat bran and pine needle powder, add 1.5 times the weight of water, inoculate with 0.6wt% compound bacteria, ferment at 30-35℃ for 6 days; and obtain the fermentation product.

[0061] (6) Mix the fermentation product with the mixture, seaweed powder, yeast selenium and salt evenly, place it on a mesh screen, and fumigate with 5 times the weight of mugwort water. After the mugwort water is evaporated, dry it and crush it into particles with a particle size of 1.5-2mm to obtain the feed.

[0062] The traditional Chinese medicine composition in step (1) is made by mixing the following raw materials in parts by weight: 28 parts of Codonopsis pilosula, 28 parts of Astragalus membranaceus, 22 parts of Nelumbo nucifera, 19 parts of Dryopteris crassirhizoma, 19 parts of Taraxacum mongolicum, 16 parts of Phellodendron chinense, 16 parts of Dioscorea opposita, 18 parts of Atractylodes macrocephala, 19 parts of Crataegus pinnatifida and 11 parts of Glycyrrhiza uralensis; the bone refers to bovine bone.

[0063] Step (5) The compound bacterial strain is a mixture of Bacillus subtilis and Lactobacillus plantarum in a weight ratio of 1:2. Example

[0064] A process for preparing fattening pig feed includes the following steps:

[0065] (1) Ingredients: 45 parts corn flour, 25 parts wheat bran, 12 parts pine needle powder, 15 parts bone, 6 parts pig skin, 5 parts seaweed powder, 3 parts traditional Chinese medicine composition, 5 parts shiitake mushroom root, 0.2 parts polyglycerol fatty acid ester, 0.2 parts yeast selenium, 6 parts chitosan and 0.5 parts salt;

[0066] (2) After pulverizing the Chinese herbal composition, add 6 times the amount of water and soak for 2 hours, then extract. The specific extraction process is: maintain pressure at 150 MPa for 1 minute, then quickly release pressure to 5 MPa, continue to maintain pressure for 6 minutes, then release pressure to normal pressure, then filter to obtain the medicinal liquid and residue, and concentrate the medicinal liquid to one-third of the original volume to obtain concentrated medicinal liquid.

[0067] (3) Break fresh bones into pieces 1-3cm in length, cut fresh pig skin into 1-3cm cubes, put them into a steam explosion device, maintain a steam pressure of 4.5Mpa for 150s, and then release the pressure instantly to obtain bone powder collagen soup.

[0068] (4) Add polyglycerol fatty acid ester and chitosan to the concentrated drug solution, homogenize and mix with bone meal collagen soup, freeze dry to obtain a mixture;

[0069] (5) Crush the shiitake mushroom root, mix it evenly with the medicinal residue, corn flour, wheat bran and pine needle powder, add 2 times the weight of water, inoculate with 0.5% compound bacteria, ferment at 30-35℃ for 8 days; and obtain the fermentation product.

[0070] (6) Mix the fermentation product with the mixture, seaweed powder, yeast selenium and salt evenly, place it on a mesh screen, and fumigate with 5 times the weight of mugwort water. After the mugwort water is evaporated, dry it and crush it into particles with a particle size of 1.5-2mm to obtain the feed.

[0071] The traditional Chinese medicine composition in step (1) is made by mixing the following raw materials in parts by weight: 30 parts of Codonopsis pilosula, 30 parts of Astragalus membranaceus, 20 parts of Nelumbo nucifera, 20 parts of Dryopteris crassirhizoma, 20 parts of Taraxacum mongolicum, 15 parts of Phellodendron chinense, 15 parts of Dioscorea opposita, 20 parts of Atractylodes macrocephala, 20 parts of Crataegus pinnatifida and 12 parts of Glycyrrhiza uralensis; the bone refers to fish bone.

[0072] Step (5) The compound bacterial strain is a mixture of Bacillus subtilis and Lactobacillus plantarum in a weight ratio of 1:2.

[0073] Performance testing and aquaculture trials

[0074] 1. Detect the main nutritional components of the feeds prepared in Examples 1-5 of this invention.

[0075] Table 1. Nutritional composition of feed (%)

[0076] crude protein Crude fat Coarse ash Lysine Methionine Ca P 1 18.6 2.5 6.1 1.25 0.38 0.72 0.67 2 18.1 2.6 6.0 1.30 0.36 0.75 0.65 3 19.2 2.8 6.1 1.28 0.42 0.84 0.72 4 19.0 2.5 6.0 1.20 0.40 0.76 0.68 5 18.5 2.7 6.2 1.25 0.37 0.75 0.65

[0077] According to the test results, the feed prepared in Examples 1-5 of this invention has a crude protein content of ≥18.0%, a crude fat content of ≥2.5%, a crude ash content of ≤6.2%, a Ca content of 0.7-0.84%, a P content of ≥0.65%, a lysine content of ≥1.20%, and a methionine content of ≥0.36%, and the nutritional composition meets the national standards.

[0078] 2. 1200 local crossbred piglets weighing 20kg were randomly divided into 6 groups of 200 each, with half males and half females. Groups 1-5 were the experimental groups, fed with the feeds described in Examples 1-5 of this invention. Group 6 was the control group, which was fed with a corn-soybean meal basal diet for 40 days. Various parameters were recorded during the experiment, including the diarrhea rate = [number of diarrhea episodes / (number of experimental pigs × number of experimental days)] × 100% (one diarrhea episode is defined as one diarrhea episode per piglet on 1 day). The results are shown in Table 2.

[0079] Table 2 Piglet growth performance

[0080] Meat-to-fat ratio Diarrhea rate % mortality rate% 1 2.06 6.87±3.10 0.5 2 2.18 6.75±2.25 0 3 1.97 5.63±2.22 0 4 2.22 7.56±2.40 0.5 5 2.31 6.18±2.81 0 control group 2.52 12.5±2.24 2

[0081] As shown in Table 2, the feed prepared using Examples 1-5 of the present invention has a significantly improved feed utilization rate, enhanced disease resistance in piglets, and lower mortality and diarrhea rates compared to the control group. This indicates that the feed of the present invention can improve the disease resistance of piglets and promote growth.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A process for the preparation of a finishing pig feed, characterized in that: Includes the following steps: (1) Ingredients: 30-45 parts corn flour, 25-38 parts wheat bran, 10-12 parts pine needle powder, 9-15 parts bone, 6-10 parts pig skin, 3-6 parts seaweed powder, 3-6 parts traditional Chinese medicine composition, 5-10 parts shiitake mushroom root, 0.1-0.2 parts polyglycerol fatty acid ester, 0.2-0.3 parts yeast selenium, 3-6 parts chitosan and 0.4-0.5 parts salt; (2) After pulverizing the Chinese herbal medicine composition, add 4-6 times the amount of water and soak for 2 hours, then extract. After extraction, filter to obtain the medicinal liquid and residue. Concentrate the medicinal liquid to one-third of the original volume to obtain concentrated medicinal liquid. (3) Break fresh bones into pieces 1-3cm in length, cut fresh pig skin into 1-3cm cubes, put them into a steam explosion device, maintain a steam pressure of 3-4.5Mpa for 150-200s, and then release the pressure instantly to obtain bone powder collagen soup. (4) Add polyglycerol fatty acid ester and chitosan to the concentrated drug solution, then mix with bone meal collagen soup, freeze dry to obtain a mixture; (5) Crush the shiitake mushroom root, mix it evenly with the medicinal residue, corn flour, wheat bran and pine needle powder, add 1-2 times the weight of water, inoculate with compound bacteria, and ferment at 30-35℃ for 6-8 days to obtain the fermentation product; (6) Mix the fermentation product with the mixture, seaweed powder, yeast selenium and salt evenly, dry and then crush into particles with a particle size of 1.5-2 mm to obtain feed; After the fermentation product in step (6) is mixed evenly with the mixture, seaweed powder, yeast selenium and salt, it is placed on a mesh screen and fumigated with 5 times the weight of mugwort water. After the mugwort water is evaporated, it is dried and pulverized. The traditional Chinese medicine composition in step (1) is made by mixing the following raw materials in parts by weight: 20-30 parts of Codonopsis pilosula, 20-30 parts of Astragalus membranaceus, 20-30 parts of Nelumbo nucifera, 15-20 parts of Dryopteris crassirhizoma, 15-20 parts of Taraxacum mongolicum, 15-20 parts of Phellodendron chinense, 15-20 parts of Dioscorea opposita, 15-20 parts of Atractylodes macrocephala, 15-20 parts of Crataegus pinnatifida, and 8-12 parts of Glycyrrhiza uralensis.

2. A process for the preparation of a growing pig feed according to claim 1, characterized in that: The compound strain in step (5) is a mixture of Bacillus subtilis and Lactobacillus plantarum in a weight ratio of 1:2, with an inoculation amount of 0.3-0.6 wt%.

3. The preparation process of fattening pig feed according to claim 1, characterized in that: The extraction process in step (2) is as follows: maintain pressure at 100-150 MPa for 1-2 minutes, then quickly depressurize to 5-8 MPa, continue to maintain pressure for 6-8 minutes, and then depressurize to normal pressure.

4. The preparation process of fattening pig feed according to claim 1, characterized in that: In step (1), the bones refer to cow bones, pig bones, or fish bones.