Anti-stress feed for lambs

Abstract

The invention relates to the technical field of feeds, and particularly discloses an anti-stress feed for lambs. The feed comprises the following raw materials in parts by weight: 200 parts of corn, 100 parts of soybean meal, 50 parts of cottonseed meal, 200 parts of corn germ meal, 200 parts of alfalfa meal, 40 parts of pine needle meal, 50 parts of palm meal, 10 parts of a yeast culture, 22 parts of stone powder, 10 parts of montmorillonite, 8 parts of baking soda, 6 parts of table salt, 0.5 part of tannic acid, 0.5 part of bacillus subtilis, 0.5 part of compound enzyme, 0.1 part of a mildew preventive, 0.1 part of an antioxidant, 4 parts of 70 lysine and 0.3 part of a radix astragali crude extract. According to the feed formula, the immune function and endocrine balance of lamb organisms are effectively adjusted, and secretion of cortisol, epinephrine and other stress hormones in the stress state is reduced; meanwhile, the feed effectively guarantees nutritional ingredients, accelerates the growth speed of the lambs, reduces the digestive system burden of the lambs, and is simple in preparation process and convenient to popularize and apply.

Description

Technical Field

[0001] The invention belongs to the technical field of feed, and particularly relates to an anti-stress feed for lambs. Background Art

[0002] Sheep are important livestock in the animal husbandry industry, and their health and growth are directly related to the economic benefits of farmers. However, sheep often encounter various stressors during their husbandry, such as climate change, feed changes, and disease. These stressors can have serious impacts on their health. Therefore, understanding the prevention and response strategies for sheep stress is particularly important.

[0003] Lamb stress can hinder growth and development. Under stress, lambs mobilize significant amounts of energy to cope with the stimulus, leading to increased nutrient catabolism and decreased anabolism, resulting in loss of appetite and slowed growth. It also reduces immune function: elevated levels of hormones like adrenaline and cortisol suppress the immune system, making lambs more susceptible to disease and reducing the effectiveness of vaccinations. Abnormal behaviors such as fear, increased aggression, or decreased social interaction can occur, impacting normal life and reproduction.

[0004] Currently, although some feeds have been supplemented with single anti-stress ingredients, the effects are limited, and there are problems such as irrational ingredient combinations and poor stability of functional additives. For example, simply adding probiotics or enzyme preparations is unlikely to fully improve the digestive and immune functions of lambs, while the lack of effective anti-mold and antioxidant measures can lead to the loss of nutrients in the feed and even the production of harmful substances, posing a threat to the health of lambs. Therefore, the development of a specialized feed that can comprehensively alleviate lamb stress reactions, improve feed utilization, and is highly stable has become an urgent need in the current lamb farming industry. Summary of the Invention

[0005] The object of the present invention is to provide an anti-stress feed for lambs to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A lamb anti-stress feed, comprising the following raw materials in parts by weight:

[0008] 200 parts of corn, 100 parts of soybean meal, 50 parts of cottonseed meal, 200 parts of corn germ meal, 200 parts of alfalfa meal,

[0009] 40 parts of pine needle powder, 50 parts of palm meal, 10 parts of yeast culture, 22 parts of stone powder, 10 parts of montmorillonite, 8 parts of baking soda, 6 parts of salt, 0.5 parts of tannic acid, 0.5 parts of Bacillus subtilis, 0.5 parts of complex enzyme, 0.1 parts of mildew inhibitor, 0.1 parts of antioxidant, 4 parts of 70 lysine, and 0.3 parts of astragalus crude extract.

[0010] Preferably, the complex enzyme comprises protease, amylase and cellulase, the antifungal agent comprises sodium diacetate, benzoic acid, sodium benzoate and potassium sorbate, and the antioxidant comprises ethoxyquinoline, butylated hydroxycresol and butylated hydroxyanisole.

[0011] A method for preparing an anti-stress feed for lambs comprises the following steps:

[0012] S1. Raw material pretreatment:

[0013] Grind corn, soybean meal, cottonseed meal, corn germ meal, alfalfa meal, pine needle powder, and palm meal separately, pass through an 80-100 mesh sieve after grinding, and set aside; dissolve the crude astragalus extract in an appropriate amount of deionized water to prepare a crude astragalus extract solution, and set aside;

[0014] S2. Mixing of basic raw materials:

[0015] Weigh 200 parts of pretreated corn, 100 parts of soybean meal, 50 parts of cottonseed meal, 200 parts of corn germ meal, 200 parts of alfalfa meal, 40 parts of pine needle powder, and 50 parts of palm meal in parts by weight, put them into a mixer, and mix them at a low speed (100-150 rpm) for 5-8 minutes to ensure uniform mixing.

[0016] S3. Add minerals and some additives:

[0017] Add 22 parts of stone powder, 10 parts of montmorillonite, 8 parts of baking soda, 6 parts of table salt, and 4 parts of 70 lysine to the mixed basic raw materials, and continue mixing at low speed for 3-5 minutes to fully combine the minerals with the basic raw materials;

[0018] S4. Add functional additives:

[0019] Then add 0.5 parts of tannic acid, 0.5 parts of Bacillus subtilis, 0.5 parts of complex enzyme, 0.1 parts of mildew inhibitor, and 0.1 parts of antioxidant, and slowly add the reserved astragalus extract solution while stirring. Keep stirring at low speed for 6-8 minutes to ensure that the additives are evenly dispersed;

[0020] S5, Mixed:

[0021] Add 10 parts of yeast culture to the above mixture, adjust the mixer speed to 200-250 rpm, and mix at high speed for 10-15 minutes to fully mix all the raw materials. Send the mixed material into a granulator and granulate it at a temperature of 80-85°C and a humidity of 15-20%. The particle diameter is controlled to be 3-5 mm.

[0022] S6. Cooling and drying: The prepared pellet feed is sent to a cooler and cooled to room temperature (20-25°C). It is then dried to reduce the moisture content of the feed to below 10%. The dried pellet feed is sieved to remove fine powder and broken particles, and is then packaged and sealed for storage.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention combines a crude astragalus extract with functional ingredients such as tannic acid to achieve synergistic effects. The crude astragalus extract can regulate the lamb's immune function and endocrine balance, reducing the secretion of stress hormones such as cortisol and adrenaline during stressful conditions. Tannic acid can inhibit the growth of harmful intestinal bacteria and alleviate intestinal stress reactions. Together with Bacillus subtilis, these two ingredients effectively improve the lamb's physiological state during stressful situations such as weaning and transportation, reducing diarrhea rates and morbidity.

[0025] The complex enzymes added to the feed specifically break down the protein, starch, and cellulose in the raw materials. Together with the yeast culture, they provide nutrition for beneficial intestinal bacteria, promoting a balanced intestinal flora and improving the lambs' digestion and absorption of nutrients in the feed. Furthermore, scientific raw material pretreatment and mixing processes ensure uniform dispersion of all ingredients, minimizing nutrient waste, reducing feed-to-weight ratios, and accelerating lamb growth.

[0026] The feed, which includes corn and soybean meal as basic ingredients, provides ample energy and protein, while alfalfa meal and pine needle powder supplement dietary fiber and vitamins. 70% lysine and stone powder improve the balance of amino acids and minerals, meeting the nutritional needs of lambs for growth and development. The optimized ratios of these ingredients ensure comprehensive nutrition, while the montmorillonite adsorbs intestinal toxins, and the baking soda regulates rumen pH, reducing the burden on the digestive system. Furthermore, the present invention features a simple preparation process, making it easy to promote and apply. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0028] Example 1:

[0029] The invention discloses an anti-stress feed for lambs. The prepared materials include 200kg of corn, 100kg of soybean meal, 50kg of cottonseed meal, 200kg of corn germ meal, 200kg of alfalfa meal, 40kg of pine needle powder, 50kg of palm meal, 10kg of yeast culture, 22kg of stone powder, 10kg of montmorillonite, 8kg of baking soda, 6kg of table salt, 0.5kg of tannic acid, 0.5kg of Bacillus subtilis, 0.5kg of complex enzyme (including 0.2kg of protease, 0.2kg of amylase, and 0.1kg of cellulase), 0.1kg of mildew inhibitor (calcium propionate), 0.1kg of antioxidant (ethoxyquin), 4kg of 70 lysine, and 0.3kg of astragalus crude extract.

[0030] Specific preparation method;

[0031] Raw material pretreatment: 200 kg of corn, 100 kg of soybean meal, 50 kg of cottonseed meal, 200 kg of corn germ meal, 200 kg of alfalfa meal, 40 kg of pine needle powder, and 50 kg of palm oil meal were pulverized in a grinder. After pulverization, the mixture was passed through a 90-mesh sieve and the undersize fraction was collected for later use. 0.3 kg of crude astragalus extract was added to 5 L of deionized water and stirred until completely dissolved to prepare a crude astragalus extract solution. The solution was then sealed and refrigerated for later use.

[0032] Mix the basic raw materials; weigh 200 kg of pretreated corn, 100 kg of soybean meal, 50 kg of cottonseed meal, 200 kg of corn germ meal, 200 kg of alfalfa meal, 40 kg of pine needle powder, and 50 kg of palm meal, put them into a horizontal mixer, set the speed to 120 rpm, and mix for 6 minutes to obtain the preliminary mixed basic raw materials.

[0033] Add minerals and some additives; add 22kg stone powder, 10kg montmorillonite, 8kg baking soda, 6kg salt, and 4kg70 lysine to the above basic raw materials, maintain the speed of 120 rpm and continue mixing for 4 minutes to fully combine the minerals with the basic raw materials.

[0034] Add functional additives; add 0.5kg of tannic acid, 0.5kg of Bacillus subtilis, 0.5kg of complex enzyme (containing 0.2kg of protease, 0.2kg of amylase, and 0.1kg of cellulase), 0.1kg of mildew inhibitor (calcium propionate), and 0.1kg of antioxidant (ethoxyquin) in sequence, start stirring at the same time, and slowly pour in the reserved astragalus crude extract solution while stirring at a speed of 120 rpm, and stir for 7 minutes to ensure that all additives are evenly dispersed.

[0035] Final mixing and granulation: add 10kg of yeast culture, adjust the mixer speed to 220 rpm, mix at high speed for 12 minutes to completely mix the materials, and send the mixed materials into the ring die pelletizer. Set the pelletizing temperature to 82°C and the humidity to 18%. Control the particle diameter to 4mm during the pelletizing process to obtain the initial pellet feed.

[0036] Cooling, drying, and packaging: The pelleted feed is fed into a countercurrent cooler and cooled to 23°C. It is then transferred to a drum dryer and dried at 60°C for 30 minutes to reduce the moisture content to 8%. The dried pelleted feed is sieved through a vibrating screen to remove fine powder and debris, then packaged in double-layer plastic woven bags (25kg / bag), sealed, and stored in a ventilated, dry place.

[0037] Implementation 2:

[0038] The invention discloses an anti-stress feed for lambs. The prepared materials include 200kg of corn, 100kg of soybean meal, 50kg of cottonseed meal, 200kg of corn germ meal, 200kg of alfalfa meal, 40kg of pine needle powder, 50kg of palm meal, 10kg of yeast culture, 22kg of stone powder, 10kg of montmorillonite, 8kg of baking soda, 6kg of table salt, 0.5kg of tannic acid, 0.5kg of Bacillus subtilis, 0.5kg of complex enzyme (including 0.2kg of protease, 0.2kg of amylase, and 0.1kg of cellulase), 0.1kg of mildew inhibitor (sodium diacetate), 0.1kg of antioxidant (di-tert-butylated cresol), 4kg of 70-lysine, and 0.3kg of astragalus crude extract.

[0039] Specific preparation;

[0040] Raw material pretreatment: 200 kg of corn, 100 kg of soybean meal, 50 kg of cottonseed meal, 200 kg of corn germ meal, 200 kg of alfalfa meal, 40 kg of pine needle powder, and 50 kg of palm oil meal were pulverized in a grinder. After pulverization, the pulverized material was passed through an 80-mesh sieve and the undersize fraction was collected for later use. 0.3 kg of crude astragalus extract was added to 6 L of deionized water and stirred until completely dissolved to prepare a crude astragalus extract solution. The solution was then sealed and refrigerated for later use.

[0041] Mix the basic raw materials; weigh 200 kg of pretreated corn, 100 kg of soybean meal, 50 kg of cottonseed meal, 200 kg of corn germ meal, 200 kg of alfalfa meal, 40 kg of pine needle powder, and 50 kg of palm meal, put them into a vertical mixer, set the speed to 100 rpm, and mix for 8 minutes to obtain the preliminary mixed basic raw materials.

[0042] Add minerals and some additives; add 22kg stone powder, 10kg montmorillonite, 8kg baking soda, 6kg salt, and 4kg70 lysine to the above basic raw materials, maintain the speed of 100 rpm and continue mixing for 5 minutes to fully combine the minerals with the basic raw materials.

[0043] Add functional additives; add 0.5kg of tannic acid, 0.5kg of Bacillus subtilis, 0.5kg of complex enzyme (containing 0.2kg of protease, 0.2kg of amylase, and 0.1kg of cellulase), 0.1kg of mildew inhibitor (sodium diacetate), and 0.1kg of antioxidant (di-tert-butylated cresol) in sequence, start stirring at the same time, and slowly pour in the reserved astragalus crude extract solution while stirring at a speed of 100 rpm, and stir for 8 minutes to ensure that all additives are evenly dispersed.

[0044] Final mixing and granulation: Add 10kg of yeast culture, adjust the mixer speed to 200 rpm, and mix at high speed for 15 minutes to thoroughly mix the materials. The mixed materials are fed into a flat die pelletizer, set at a pelletizing temperature of 80°C and a humidity of 15%, and the pellet diameter is controlled to 3mm during the pelletizing process to obtain the initial pellet feed.

[0045] Cooling, drying, and packaging: The pelleted feed is fed into a fluidized bed cooler and cooled to 20°C. It is then transferred to a box dryer and dried at 55°C for 40 minutes to reduce the moisture content to 9%. The dried pelleted feed is sieved through a vibrating screen to remove fine powder and broken particles. It is then packaged in kraft paper bags (50kg / bag), sealed, and stored in a cool, dry place.

[0046] Embodiment 3;

[0047] The invention discloses an anti-stress feed for lambs. The prepared materials include 200kg of corn, 100kg of soybean meal, 50kg of cottonseed meal, 200kg of corn germ meal, 200kg of alfalfa meal, 40kg of pine needle powder, 50kg of palm meal, 10kg of yeast culture, 22kg of stone powder, 10kg of montmorillonite, 8kg of baking soda, 6kg of table salt, 0.5kg of tannic acid, 0.5kg of Bacillus subtilis, 0.5kg of complex enzyme (including 0.2kg of protease, 0.2kg of amylase, and 0.1kg of cellulase), 0.1kg of mildew inhibitor (calcium propionate), 0.1kg of antioxidant (butylated hydroxyanisole), 4kg of 70-lysine, and 0.3kg of astragalus crude extract.

[0048] Specific preparation;

[0049] Raw material pretreatment: corn, soybean meal, cottonseed meal, corn germ meal, alfalfa meal, pine needle powder, and palm meal were crushed separately with a hammer mill, and then passed through a 100-mesh sieve. The particle size qualification rate of the sieved material was ≥95%, and the material was set aside. The crude extract of Astragalus membranaceus was dissolved in 4 L of deionized water to a solution concentration of 7.5%, and the solution was sealed and stored away from light for later use.

[0050] Mixing the basic raw materials; putting the pretreated basic raw materials into a ribbon mixer, setting the speed to 150 rpm, mixing for 5 minutes, and the coefficient of variation of the mixing uniformity ≤7% to obtain a preliminary mixed material.

[0051] Add minerals and some additives; add stone powder, montmorillonite, baking soda, salt, 70 lysine, maintain the speed of 150 rpm and mix for 3 minutes. After mixing, the uniformity of mineral distribution in the material is ≥90%.

[0052] Add functional additives; add tannic acid, Bacillus subtilis, complex enzyme, mildew inhibitor (calcium propionate), antioxidant (butylated hydroxyanisole) in sequence, add astragalus crude extract solution while stirring (150 rpm), stir for 6 minutes, and the dispersion of additives in the material is ≥98%.

[0053] Finally, the mixture was mixed and granulated; yeast culture was added, the speed was adjusted to 250 rpm, and the mixture was mixed for 10 minutes; a ring die granulator was used, the ring die compression ratio was set to 1:8, the granulation temperature was 85°C, the humidity was 20%, and the particle diameter was 5 mm.

[0054] Cool, dry and package; cool to 25°C using a countercurrent cooler, with the temperature difference between the pellets and the ambient temperature ≤3°C after cooling; transfer to a vacuum dryer and dry at 65°C for 25 minutes, with a final moisture content of ≤7%;

[0055] After screening by the drum screen, the qualified particles in the screened material account for ≥98%, and are packaged in 40kg / bag aluminum-plastic composite bags. The sealing performance of the packaging bags is ≥0.05MPa and the negative pressure can be maintained for 30 seconds without leakage. They are stored in a warehouse with a temperature of ≤25℃ and a relative humidity of ≤60%.

[0056] Experimental methods;

[0057] 1. Experimental Materials and Grouping

[0058] Experimental animals: 120 healthy weaned lambs (Small Tail Han sheep) aged 45 days and with similar body weight (10.5±0.5 kg) were randomly divided into 4 groups, 30 lambs in each group, and 3 replicates in each group (10 lambs in each replicate).

[0059] Feed Grouping:

[0060] Control group (CK): conventional lamb complete feed (excluding astragalus crude extract, tannic acid and other anti-stress ingredients);

[0061] Experimental group 1 (T1): lamb anti-stress feed prepared in Example 1;

[0062] Experimental group 2 (T2): lamb anti-stress feed prepared in Example 2;

[0063] Experimental group 3 (T3): The lamb anti-stress feed prepared in Example 3 was used.

[0064] 2. Experimental Design and Feeding Management

[0065] Experimental period: 60 days in total, including a 7-day adaptation period and a 53-day formal period.

[0066] Stress treatment: Transport stress treatment was performed on the 30th day of the formal period (lambs were placed in transport cages and transported at a speed of 60 km / h for 3 hours to simulate transport stress).

[0067] Rearing conditions: Lambs in each group were housed in the same sheep shed, fed in individual pens, with free access to food and water. The pens were cleaned twice a day, and the ambient temperature was maintained at 18-22°C, relative humidity at 60-65%, and natural light.

[0068] Feeding management: Feed once at 08:00 and 16:00 every day, record the feed intake of each pen, and adjust the feeding amount every week to ensure that there is no leftover feed or the leftover feed amount is ≤5%.

[0069] 3. Measurement indicators and methods

[0070] Growth performance indicators

[0071] The fasting body weights of lambs were weighed at the beginning of the experiment (0 day), before stress (29 days), 7 days after stress (36 days), and at the end of the experiment (60 days), and the average daily gain (ADG) was calculated;

[0072] Record daily feed intake and calculate feed-to-gain ratio (F / G = total feed intake / total weight gain).

[0073] Anti-stress index

[0074] 5 mL of jugular venous blood was collected 1 day before stress (29 days) and 2 hours, 6 hours, 24 hours, and 72 hours after stress, and the serum was separated by centrifugation (3000 r / min, 10 min). The levels of cortisol and epinephrine in the serum were determined by enzyme-linked immunosorbent assay (ELISA);

[0075] Seven days after the stress, the diarrhea rate of lambs in each group was counted (number of lambs with diarrhea / total number of lambs×100%).

[0076] Immune indicators

[0077] At the end of the experiment, serum was collected to determine the levels of immunoglobulins IgG and IgA (turbidimetric method) and lysozyme activity (colorimetric method).

[0078] Digestibility index

[0079] In the last 7 days of the experiment, feces of lambs in each pen were collected using the total fecal collection method to determine the apparent digestibility of dry matter (DM), crude protein (CP), and crude fiber (CF) in the feed (referring to the GB / T 23742-2009 method).

[0080] 4. Data Statistics and Analysis

[0081] The experimental data were analyzed by one-way analysis of variance (ANOVA) using SPSS 22.0 software. Duncan's multiple comparisons were used for comparison between groups. The results were expressed as "mean ± standard deviation". P < 0.05 indicated a significant difference, and P < 0.01 indicated an extremely significant difference.

[0082] 5. Expected Experimental Results and Verification Directions

[0083] Anti-stress effect: It is expected that the peak levels of serum cortisol and adrenaline in the three experimental groups of lambs after stress will be significantly lower than those in the control group, and the time it takes to recover to normal levels will be shorter; the diarrhea rate will be significantly lower than that in the control group, among which the T3 group may have the best anti-stress effect due to more precise process parameters.

[0084] Growth performance: The average daily weight gain of the experimental group was significantly higher than that of the control group, and the feed-to-weight ratio was significantly lower than that of the control group (P<0.05). Due to the different pelleting processes and pellet characteristics, there may be slight differences in feeding convenience among the T1, T2, and T3 groups.

[0085] Immunity and digestion: The immunoglobulin content and lysozyme activity of the experimental group were significantly higher than those of the control group, and the digestibility of dry matter and crude protein increased by 5%-8%, verifying the synergistic effect of the complex enzyme and Bacillus subtilis in the feed.

[0086] Through the above experiments, we can systematically verify the effects of the feed of the present invention in alleviating lamb stress response, promoting growth, and enhancing immunity, and at the same time compare the effects of different preparation processes on the feed effects.

[0087] It will be appreciated that in the development of any actual embodiment, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will, for those of ordinary skill having the benefit of this disclosure, be a routine undertaking of design, fabrication, and production without undue experimentation.

[0088] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A lamb anti-stress feed, characterized in that: The feed comprises the following raw materials in parts by weight: 200 parts of corn, 100 parts of soybean meal, 50 parts of cottonseed meal, 200 parts of corn germ meal, 200 parts of alfalfa meal, 40 parts of pine needle powder, 50 parts of palm meal, 10 parts of yeast culture, 22 parts of stone powder, 10 parts of montmorillonite, 8 parts of baking soda, 6 parts of salt, 0.5 parts of tannic acid, 0.5 parts of Bacillus subtilis, 0.5 parts of complex enzyme, 0.1 parts of mildew inhibitor, 0.1 parts of antioxidant, 4 parts of 70 lysine, and 0.3 parts of astragalus crude extract.

2. The lamb anti-stress feed according to claim 1, characterized in that: The complex enzyme comprises protease, amylase and cellulase; the antifungal agent comprises sodium diacetate, benzoic acid, sodium benzoate and potassium sorbate; and the antioxidant comprises ethoxyquinoline, butylated methylphenol and butylated hydroxyanisole.

3. The method for preparing an anti-stress feed for lambs according to any one of claims 1 to 2, characterized in that: The following steps are included: S1. Raw material pretreatment: Grind corn, soybean meal, cottonseed meal, corn germ meal, alfalfa meal, pine needle powder, and palm meal separately, pass through an 80-100 mesh sieve after grinding, and set aside; dissolve the crude astragalus extract in an appropriate amount of deionized water to prepare a crude astragalus extract solution, and set aside; S2. Basic raw material mixing: Weigh 200 parts of pretreated corn, 100 parts of soybean meal, 50 parts of cottonseed meal, 200 parts of corn germ meal, 200 parts of alfalfa meal, 40 parts of pine needle powder, and 50 parts of palm meal in parts by weight, put them into a mixer, and mix them at a low speed (100-150 rpm) for 5-8 minutes to ensure uniform mixing. S3. Add minerals and some additives: Add 22 parts of stone powder, 10 parts of montmorillonite, 8 parts of baking soda, 6 parts of table salt, and 4 parts of 70 lysine to the mixed basic raw materials, and continue mixing at low speed for 3-5 minutes to fully combine the minerals with the basic raw materials; S4. Add functional additives: Then add 0.5 parts of tannic acid, 0.5 parts of Bacillus subtilis, 0.5 parts of complex enzyme, 0.1 parts of mildew inhibitor, and 0.1 parts of antioxidant, and slowly add the reserved astragalus extract solution while stirring. Keep stirring at low speed for 6-8 minutes to ensure that the additives are evenly dispersed; S5, Mixed: Add 10 parts of yeast culture to the above mixture, adjust the mixer speed to 200-250 rpm, and mix at high speed for 10-15 minutes to fully mix all the raw materials. Send the mixed material into a granulator and granulate it at a temperature of 80-85°C and a humidity of 15-20%. The particle diameter is controlled to be 3-5 mm. S6. Cooling and drying: The prepared pellet feed is sent to a cooler and cooled to room temperature (20-25°C). It is then dried to reduce the moisture content of the feed to below 10%. The dried pellet feed is sieved to remove fine powder and broken particles, and is then packaged and sealed for storage.