Feed for improving immunity, promoting growth and improving meat quality and preparation method thereof

Abstract

The invention belongs to the technical field of animal feed. The invention provides a feed for improving immunity, promoting growth and improving meat quality, which is characterized in that the feed is used for feeding Jiangkou radish pigs; the feed comprises a feed additive and a basal feed, wherein the feed additive is dry powder obtained by fermenting and drying a purple perilla herb aqueous extract, an achnatherum splendens herb aqueous extract and corn grit which are used as fermentation substrates according to the weight ratio of (3-5): 1: 8. The feed disclosed by the invention solves the problem that the existing feed is insufficient in promoting the fattening performance of the Jiangkou radish pigs, is suitable for feeding the Jiangkou radish pigs in the whole growth cycle, can remarkably improve the average daily gain of the Jiangkou radish pigs, reduces the diarrhea rate and effectively improves the meat quality, and has relatively good popularization and application values.

Description

Technical Field

[0001] The invention belongs to the technical field of animal feed, and in particular relates to a feed capable of improving immunity, promoting growth and improving meat quality, and a preparation method thereof. Background Art

[0002] The Jiangkou Radish Pig is native to Guizhou Province. Its coat is mainly black, with white hair on its forehead, feet, and tail tip. It is small in size, and has the advantages of early maturity, easy fattening, thin skin, fine bones, and rich meat flavor.

[0003] Although Jiangkou Radish Pig has excellent meat quality, it is not widely promoted in the pork market. One of the reasons is that Jiangkou Radish Pig has poor fattening performance and low breeding economy. The inventor’s unit, Guizhou Provincial Animal Husbandry and Veterinary Research Institute, conducted a fattening experiment under rural breeding conditions in 1988. The daily weight gain of Jiangkou Radish Pig was only 340g. In recent years, although breeding conditions have been greatly improved, the improvement of Jiangkou Radish Pig’s fattening performance is still limited. For example, according to a study in 2018 by the Animal Husbandry Technology Extension Station of Jiangkou County, Guizhou Province [1] When fed with green fodder, the average daily weight gain of Jiangkou radish pigs is only 418g. According to the inventor's research and observation over the years, the average daily weight gain of Jiangkou radish pigs can be increased to about 500-600g with the addition of special additives. For example, the Zhiyuan Productivity Promotion Center in Jiangkou County, Guizhou Province, once studied the effects of adding ecological pine needle powder and ecological composite rattan tea feed additives on the fattening performance of Jiangkou radish pigs, and found that the average daily weight gain can be increased to 629g and 532g respectively. [2-3] ; Chinese patent application CN 107114586 A increases the average daily weight gain of Jiangkou radish pigs to 489.32g by adding coptis extract and Achyranthes bidentata polysaccharide and specific fermentation products. In addition, there are some studies (such as Chinese patent application CN 118947824A provides a solution with Chinese medicine additives), which can increase the average daily weight gain of Jiangkou radish pigs to about 730-780g, but this type of feed that can obtain extremely high daily weight gain generally has poor palatability due to the addition of multiple Chinese medicinal materials, and is only suitable for feeding pigs in the middle and late stages of growth. For example, CN118947824 A only feeds pigs weighing 14kg with feed containing Chinese medicine additives.

[0004] It is not difficult to find that the current technical solutions for Jiangkou radish pig breeding have the following problems: (1) The fattening performance of Jiangkou radish pig is poor and the economic efficiency is low; (2) There are few reports on improving the fattening performance of Jiangkou radish pig, and the degree of improvement in fattening performance is usually low; (3) Although a few solutions can significantly increase daily weight gain, their palatability is poor, they are not suitable for full-cycle feeding, and the management cost is high.

[0005] In another research work (a patent has been applied for separately), the inventor found that the weaned pig feed based on perilla extract has an excellent feeding effect on the weaned pigs of Congjiang Xiang pigs. Considering that Jiangkou Radish Pigs, like Congjiang Xiang pigs, are also a breed that is difficult to improve the economic efficiency of breeding, the inventor also used this feed to feed the weaned pigs of Jiangkou Radish Pigs and found that the feeding effect was also very good. However, during the full-cycle feeding, the inventor found that although the feed was suitable for Congjiang Xiang pigs, it was not suitable for Jiangkou Radish Pigs.

[0006] In summary, how to develop a feed that can solve the above problems faced in breeding Jiangkou radish pigs is an issue that urgently needs to be solved in this field.

[0007] This section cites prior art:

[0008] [1] Meng Hua. Excellent local pig breeds - Jiangkou Radish Pig[J]. Rural Encyclopedia, 2018, (17): 28. DOI: 10.19433 / j.cnki.1006-9119.2018.17.023.

[0009] [2] Yang Maolin, Li Mingzu. Effects of ecological pine needle powder on fattening performance and disease resistance of Jiangkou radish pigs[J]. Feed Research, 2015, (11): 43-44+57. DOI: 10.13557 / j.cnki.issn1002-2813.2015.11.012.

[0010] [3] Yang Maolin, Li Mingzu, Liu Ruoyu. Effects of ecological composite rattan tea feed additive on fattening performance and disease resistance of Jiangkou radish pigs[J]. Guizhou Animal Husbandry and Veterinary Medicine, 2014, 38(05):11-13. Summary of the invention

[0011] In view of the defects of the prior art, the present invention aims to provide a feed that can effectively promote the fattening performance of Jiangkou Radish Pig, improve its immunity to reduce the diarrhea rate and improve the meat quality. In order to achieve this purpose, the present invention provides the following technical solutions:

[0012] A feed for improving immunity, promoting growth and improving meat quality, characterized in that the feed is used for feeding Jiangkou radish pigs; the feed comprises a feed additive and a basic feed; wherein the feed additive is a dry powder obtained by fermenting and drying a water extract of the whole herb of Perilla frutescens, a water extract of the whole herb of Achnatherum splendens and corn residue as a fermentation substrate in a weight ratio of 3 to 5:1:8;

[0013] During the fermentation, the fermentation bacteria used are a mixed bacteria of Aspergillus niger YM33182 and Aspergillus niger Z-9; the Aspergillus niger YM33182 has a preservation number of CCTCC No: M 206113; the Aspergillus niger Z-9 has a preservation number of CGMCC No.11130;

[0014] The whole herb water extract of Perilla frutescens and the whole herb water extract of Achnatherum splendens are extracts obtained by using the whole herb water extract of Perilla frutescens and the whole herb water extract of Achnatherum splendens as substrates through a hydrothermal extraction method.

[0015] Preferably, the added weight percentage of the feed additive is 2%.

[0016] Preferably, the weight ratio of the whole herb water extract of Perilla frutescens, the whole herb water extract of Achnatherum splendens and the corn residue is 4:1:8.

[0017] Preferably, the preparation method of the water extract of the whole herb of Perilla frutescens is: take the whole herb of Perilla frutescens, add it to water in a weight ratio of 1:8, perform hydrothermal extraction at 85° C. for 4 hours, concentrate it using a rotary evaporator, and then freeze-dry it to obtain the water extract.

[0018] Preferably, the preparation method of the Achnatherum splendens whole herb water extract is: take the whole herb of Achnatherum sphenanthera, add it to water in a weight ratio of 1:10, perform hydrothermal extraction at 85° C. for 4 hours, concentrate it using a rotary evaporator, and then freeze-dry it to obtain the extract.

[0019] Specifically, the corn residue is the residue obtained by grinding cooked corn.

[0020] Preferably, in the mixed bacteria of Aspergillus niger YM33182 and Aspergillus niger Z-9, the cell number ratio of the two bacteria is 1:1-3.

[0021] Preferably, during fermentation, the mixed bacteria has an inoculation amount of 2% by volume.

[0022] Preferably, the formula of the basic feed is as follows according to weight percentage: 58% corn, 10% broken rice, 10% bran, 10% soybean cake, 8% fish meal, 2.5% green feed, 0.5% calcium carbonate, 0.5% calcium phosphate, and 0.5% salt.

[0023] Another object of the present invention is to provide a method for preparing the above feed, that is, to mix the feed additive and the basic feed evenly.

[0024] Beneficial effects of the present invention:

[0025] The feed of the invention solves the problem that the existing feed is insufficient in promoting the fattening performance of Jiangkou radish pigs, is suitable for feeding Jiangkou radish pigs throughout their entire growth cycle, can significantly increase the average daily weight gain of Jiangkou radish pigs, reduce the diarrhea rate and effectively improve meat quality, and has good promotion and application value. DETAILED DESCRIPTION

[0026] The present invention is described in detail below through examples. It is necessary to point out that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by technical personnel in this field based on the above invention content still fall within the scope of protection of the present invention.

[0027] Example 1

[0028] According to weight percentage, 2% of the feed additive and 98% of the basic feed are mixed evenly to obtain the feed.

[0029] The formula of the basic feed is as follows according to weight percentage: 58% corn, 10% broken rice, 10% bran, 10% soybean cake, 8% fish meal, 2.5% green feed, 0.5% calcium carbonate, 0.5% calcium phosphate, and 0.5% salt.

[0030] The feed additive is prepared from water extract of whole herb of Perilla frutescens, water extract of whole herb of Achnatherum splendens and corn residue as fermentation substrates in a weight ratio of 4:1:8, and the dry powder is obtained after fermentation and drying.

[0031] The preparation method of the water extract of the whole plant of Perilla frutescens is as follows: take the whole plant of Perilla frutescens, add it to water at a weight ratio of 1:8, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it. The preparation method of the water extract of the whole plant of Achnatherum splendens is as follows: take the whole plant of Achnatherum splendens, add it to water at a weight ratio of 1:10, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it.

[0032] Corn grits are the residue obtained after grinding cooked corn (including corn kernels and corn cobs).

[0033] The whole plant water extract of Perilla frutescens, the whole plant water extract of Achnatherum splendens and corn residue are mixed in a weight ratio of 3:1:8, sterile water is added to make the solid-liquid weight ratio of 2.5:1, and Aspergillus niger YM33182 and Aspergillus niger Z-9 (the number of bacteria is 1:1) are inoculated with an inoculum amount of 2% for fermentation at 28-32°C for 36 hours; the fermentation product is drained and freeze-dried to obtain the fermented hawthorn dry powder; the Aspergillus niger YM33182 has a preservation number of CCTCC No: M 206113; the Aspergillus niger Z-9 has a preservation number of CGMCC No.11130.

[0034] The Aspergillus niger YM33182 and Aspergillus niger Z-9 are owned by the laboratory, and the present invention does not involve the screening and preservation of them.

[0035] Example 2

[0036] According to weight percentage, 2% of the feed additive and 98% of the basic feed are mixed evenly to obtain the feed.

[0037] The formula of the basic feed is as follows according to weight percentage: 58% corn, 10% broken rice, 10% bran, 10% soybean cake, 8% fish meal, 2.5% green feed, 0.5% calcium carbonate, 0.5% calcium phosphate, and 0.5% salt.

[0038] The feed additive is prepared from water extract of whole herb of Perilla frutescens, water extract of whole herb of Achnatherum splendens and corn residue as fermentation substrates in a weight ratio of 3:1:8, and the dry powder is obtained after fermentation and drying.

[0039] The preparation method of the water extract of the whole plant of Perilla frutescens is as follows: take the whole plant of Perilla frutescens, add it to water at a weight ratio of 1:8, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it. The preparation method of the water extract of the whole plant of Achnatherum splendens is as follows: take the whole plant of Achnatherum splendens, add it to water at a weight ratio of 1:10, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it.

[0040] Corn grits are the residue obtained after grinding cooked corn (including corn kernels and corn cobs).

[0041] The whole plant water extract of Perilla frutescens, the whole plant water extract of Achnatherum splendens and corn residue are mixed in a weight ratio of 3:1:8, sterile water is added to make the solid-liquid weight ratio of 2.5:1, and Aspergillus niger YM33182 and Aspergillus niger Z-9 (cell number ratio of 1:2) are inoculated with an inoculum amount of 2% for fermentation at 28-32°C for 36 hours; the fermentation product is drained and freeze-dried to obtain the fermented hawthorn dry powder; the Aspergillus niger YM33182 has a preservation number of CCTCC No: M 206113; the Aspergillus niger Z-9 has a preservation number of CGMCC No.11130.

[0042] The Aspergillus niger YM33182 and Aspergillus niger Z-9 are owned by the laboratory, and the present invention does not involve the screening and preservation of them.

[0043] Example 3

[0044] According to weight percentage, 2% of the feed additive and 98% of the basic feed are mixed evenly to obtain the feed.

[0045] The formula of the basic feed is as follows according to weight percentage: 58% corn, 10% broken rice, 10% bran, 10% soybean cake, 8% fish meal, 2.5% green feed, 0.5% calcium carbonate, 0.5% calcium phosphate, and 0.5% salt.

[0046] The feed additive is prepared from water extract of whole herb of Perilla frutescens, water extract of whole herb of Achnatherum splendens and corn residue as fermentation substrates in a weight ratio of 5:1:8, and the dry powder is obtained after fermentation and drying.

[0047] The preparation method of the water extract of the whole plant of Perilla frutescens is as follows: take the whole plant of Perilla frutescens, add it to water at a weight ratio of 1:8, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it. The preparation method of the water extract of the whole plant of Achnatherum splendens is as follows: take the whole plant of Achnatherum splendens, add it to water at a weight ratio of 1:10, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it.

[0048] Corn grits are the residue obtained after grinding cooked corn (including corn kernels and corn cobs).

[0049] The whole herb water extract of Perilla frutescens, the whole herb water extract of Achnatherum splendens and corn residue are mixed in a weight ratio of 3:1:8, sterile water is added to make the solid-liquid weight ratio of 2.5:1, and Aspergillus niger YM33182 and Aspergillus niger Z-9 (cell number ratio of 1:3) are inoculated with an inoculum amount of 2% for fermentation. During the fermentation, the fermentation is carried out at 28-32°C for 36 hours; the fermentation result is drained and freeze-dried to obtain the fermented hawthorn dry powder; the Aspergillus niger YM33182 has a preservation number of: CCTCC No: M 206113; the Aspergillus niger Z-9 has a preservation number of: CGMCC No.11130.

[0050] The Aspergillus niger YM33182 and Aspergillus niger Z-9 are owned by the laboratory, and the present invention does not involve the screening and preservation of them.

[0051] Comparative Example 1

[0052] Compared with Example 1, the difference is that the whole herb of Achnatherum splendens is replaced by the whole herb of Artemisia annua, and the rest is consistent with Example 1.

[0053] Comparative Example 2

[0054] Compared with Example 1, the difference is that the weight ratio of the water extract of the whole plant of Perilla frutescens, the water extract of the whole plant of Achnatherum splendens and the corn residue is 6:1:8, and the rest is the same as Example 1.

[0055] Comparative Example 3

[0056] Compared with Example 1, the difference is that the whole herb water extract of Achnatherum splendens is not added, and the rest is consistent with Example 1.

[0057] Comparative Example 4

[0058] According to weight percentage, 1.5% of the compound Chinese herbal medicine additive and 98.5% of the basic feed are evenly mixed to obtain the product.

[0059] Among them, according to weight percentage, the basic feed formula is: corn 52.46%, wheat bran 17.18%, soybean meal 19.06%, rapeseed cake 7.00%, stone powder 0.30%, calcium hydrogen phosphate 0.30%, L-lysine 0.20%, soybean oil 1.5%, and compound premix 2%.

[0060] The composite premix is ​​a composite vitamin and mineral element, wherein the composite vitamin components are: vitamin A 170,000 IU, vitamin D 350,000 IU, vitamin E 500 mg, vitamin K 350 mg, vitamin B150 mg, vitamin B2130 mg, vitamin B660 mg, vitamin B120.45 mg, calcium pantothenate 300 mg, niacinamide 600 mg, biotin 3.6 mg, folic acid 30 mg; the mineral components are: iron 2000 mg, zinc 1700 mg, manganese 800 mg, iodine 10 mg, selenium 10 mg, sodium chloride 8%, calcium 8%, total phosphorus 1.2%.

[0061] Formula of compound Chinese herbal medicine additives: Codonopsis pilosula 12g, Poria 15g, White cardamom 10g, Hawthorn 10g, malt 12g, malt 12g, Atractylodes macrocephala 12g, Chinese yam 15g, and roasted licorice 10g.

[0062] Experimental Example 1

[0063] Experimental protocol:

[0064] A total of 140 weaned Jiangkou radish piglets from a local breeding farm in Jiangkou were used as experimental subjects and divided into 7 groups, each with 20 piglets; the feed obtained from Examples 1 to 3 and Comparative Examples 1 to 3 was used as feeding feed, and 6 groups of piglets were fed respectively; the remaining group of piglets was fed with basic feed and used as a control group. The feeding cycle was 150 days, with feeding twice a day and free drinking water, and the average daily weight gain of the first two weeks and the average daily weight gain of the whole cycle and diarrhea were recorded.

[0065] Table 1

[0066]

[0067]

[0068] As shown in Table 1, the feeds obtained in Examples 1 to 3 of the present invention can effectively improve the fattening performance of Jiangkou radish pigs, whether in the two weeks before weaning or in the feeding test period of up to 150 days. The average daily weight gain of the whole period is as high as 740 g / d, which is equivalent to the feed provided by CN 107114586 A.

[0069] Experimental Example 2

[0070] The test pigs in each group of Experimental Example 1 (3 pigs in each group) were slaughtered, and the pH (24h), marbling and intramuscular fat were measured according to the Agricultural Industry Standard of the People's Republic of China "Technical Specifications for Determination of Pig Muscle Quality NY / T821-2019". The test values ​​of each group were averaged, and the results are shown in Table 2.

[0071] Table 2

[0072]

[0073] Note: pH2 in the table refers to the data measured 24 hours after slaughter.

[0074] Generally speaking, pH value, marbling score and intramuscular fat content are important indicators for evaluating the color, juiciness and tenderness of pork. As shown in Table 2, the results of the present invention in terms of the three indicators are relatively ideal, especially in terms of marbling score and intramuscular fat content, which are significantly improved compared with the control group. Therefore, it can be seen that the quality of pork can be improved by feeding the Jiangkou radish pig with the feed of the present invention. On the other hand, there is no obvious change in comparative examples 1 to 3 compared with the control group, which shows that the three feeds have no improvement effect on Jiangkou radish pigs.

[0075] Experimental Example 3

[0076] Prior to the present invention, the inventor developed a feed with excellent breeding effects for Congjiang Xiang pigs. On this basis, the inventor preliminarily investigated the breeding effects of the feed on Jiangkou Radish Pigs and found that it had a significant promoting effect on the average daily weight gain during the early breeding period of Jiangkou Radish Pig weaned piglets. However, with further investigation, the inventor found that when the feed was used to feed Jiangkou Radish Pigs for a longer period of time, the diarrhea rate increased and the average daily weight gain decreased.

[0077] The feeding situation of this longer period is now introduced as follows:

[0078] Experimental feed:

[0079] According to the weight percentage, 2% of the feed additive and 98% of the basic feed are mixed evenly to obtain the feed additive. The feed additive is composed of the water extract of the whole plant of Perilla frutescens, the water extract of the whole plant of Artemisia argyi and the fermented dried powder of Hawthorn in the weight ratio of 3:3:1.

[0080] The preparation method of the water extract of the whole plant of Perilla frutescens is as follows: take the whole plant of Perilla frutescens, add it to water at a weight ratio of 1:8, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it. The preparation method of the water extract of the whole plant of Gnaphalium sibiricum is as follows: take the whole plant of Gnaphalium sibiricum, add it to water at a weight ratio of 1:10, perform hydrothermal extraction at 85°C for 4 hours, concentrate it by a rotary evaporator, and then freeze-dry it.

[0081] The fermented hawthorn dry powder is obtained by the following method: grinding hawthorn powder and boiled potatoes are mixed in a weight ratio of 3:1, sterile water is added to make the solid-liquid weight ratio 2.5:1, and Aspergillus niger YM33182 is inoculated with an inoculum amount of 2% for fermentation at 28-32°C for 36 hours; after draining the water from the fermentation product, freeze-drying is performed to obtain the fermented hawthorn dry powder; the Aspergillus niger YM33182 has a preservation number of: CCTCC No: M 206113.

[0082] The Aspergillus niger YM33182 is owned by the laboratory, and the present invention does not involve the screening and preservation of the Aspergillus niger YM33182.

[0083] Experimental protocol:

[0084] 20 weaned piglets of Jiangkou Radish Pig were used as test subjects. After weaning, they were fed with the above-mentioned feed in this experimental example. The feeding period was 50 days, twice a day, free drinking water, diarrhea was recorded and the average daily weight gain was investigated. The experimental results are as follows: the average daily weight gain was 354g, the number of diarrhea was 7, and the diarrhea rate was 35%. It can be seen that the above-mentioned feed is not suitable for feeding Jiangkou Radish Pigs in a longer period after feeding for 2 weeks.

[0085] Experimental Example 4

[0086] At the beginning of the inventor's research work on the present invention, through research, the inventor only found CN107114586 A in terms of patent reports, but the feed provided by the patent was not effective in promoting the daily weight gain of Jiangkou Radish Pigs, with an average daily weight gain of less than 500g. When the research on the present invention was about to end, the inventor found a second patent on Jiangkou Radish Pig breeding, namely invention patent CN 107114586 A, which was published on November 15, 2024.

[0087] According to industry common sense, Chinese herbal feed additives have poor palatability and are generally not suitable for feeding weaned piglets. Considering that the feeding starting point of the patent is when the test pig is 14 kg, the inventor speculates that it is not suitable for feeding weaned piglets. Considering that the Chinese herbal medicines and other raw materials in the feed in the invention patent CN 107114586 A are easily available on the market, the inventor immediately carried out a corresponding comparative experiment in December 2024.

[0088] This experimental example uses the feed prepared in comparative example 4, i.e., the feed used in test group 3 in invention patent CN107114586A, as the control group, and the feed obtained in example 1 as the experimental group.

[0089] A total of 20 weaned Jiangkou radish piglets from a local breeding farm in Jiangkou were taken and divided into 2 groups, one of which was fed with the feed prepared in Comparative Example 4, and the other was fed with the feed obtained in Example 1, with 20 piglets in each group. The feeding cycle was 2 weeks, and the piglets were fed twice a day with free drinking water. The average daily weight gain and diarrhea rate were investigated. As shown in Table 3, the invention patent CN 107114586 A is not suitable for feeding weaned piglets. After feeding weaned piglets, the growth performance is slightly reduced, and the diarrhea rate is not improved. The reason may be that although the additives in the patent can promote growth, they are irritating to a certain extent, resulting in poor palatability and more diarrhea.

[0090] Table 3

[0091]

Claims

1. A feed for improving immunity, promoting growth and improving meat quality, characterized in that: The feed is used for feeding Jiangkou radish pigs; the feed includes feed additives and basic feed; wherein the feed additive is a dry powder obtained by fermenting and drying the whole herb water extract of Perilla frutescens, the whole herb water extract of Achnatherum splendens and corn residue as fermentation substrates in a weight ratio of 3-5:1:8; During the fermentation, the fermentation bacteria used are a mixed bacteria of Aspergillus niger YM33182 and Aspergillus niger Z-9; the Aspergillus niger YM33182 has a preservation number of CCTCC No: M 206113; the Aspergillus niger Z-9 has a preservation number of CGMCC No.11130; The whole herb water extract of Perilla frutescens and the whole herb water extract of Achnatherum splendens are extracts obtained by using the whole herb water extract of Perilla frutescens and the whole herb water extract of Achnatherum splendens as substrates through a hydrothermal extraction method.

2. A feed for improving immunity, promoting growth and improving meat quality according to claim 1, characterized in that: The added weight percentage of the feed additive is 2%.

3. The feed for improving immunity, promoting growth and improving meat quality according to claim 1, characterized in that: The weight ratio of the water extract of the whole plant of Perilla frutescens, the water extract of the whole plant of Achnatherum splendens and the corn residue is 4:1:

8.

4. A feed for improving immunity, promoting growth and improving meat quality according to claim 3, characterized in that: The preparation method of the water extract of the whole herb of Perilla frutescens is as follows: taking the whole herb of Perilla frutescens, adding it into water in a weight ratio of 1:8, performing hydrothermal extraction at 85° C. for 4 hours, concentrating it by a rotary evaporator, and then freeze-drying it to obtain the water extract.

5. The feed for improving immunity, promoting growth and improving meat quality according to claim 3, characterized in that: The preparation method of the Achnatherum splendens whole herb water extract is as follows: taking the whole herb of Achnatherum sphenanthera, adding it to water in a weight ratio of 1:10, performing hydrothermal extraction at 85° C. for 4 hours, concentrating it using a rotary evaporator, and then freeze-drying it to obtain the extract.

6. The feed for improving immunity, promoting growth and improving meat quality according to claim 3, characterized in that: The corn residue is the residue obtained by grinding cooked corn.

7. The feed for improving immunity, promoting growth and improving meat quality according to claim 1, characterized in that: In the mixed bacteria of Aspergillus niger YM33182 and Aspergillus niger Z-9, the bacterial cell number ratio of the two bacteria is 1:1-3.

8. The feed for improving immunity, promoting growth and improving meat quality according to claim 7, characterized in that: When the mixed bacteria is fermented, the inoculation amount is 2% by volume.

9. The weaned piglet feed based on the perilla extract according to claim 5, characterized in that The formula of the basic feed is as follows according to weight percentage: 58% corn, 10% broken rice, 10% bran, 10% bean cake, 8% fish meal, 2.5% green feed, 0.5% calcium carbonate, 0.5% calcium phosphate and 0.5% salt.

10. A method for preparing a feed for improving immunity, promoting growth and improving meat quality, characterized in that: The preparation method comprises the steps of uniformly mixing the feed additive and the basic feed.

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