Laying duck feed and preparation method thereof

Abstract

The invention belongs to the field of duck feed, and particularly relates to laying duck feed and a preparation method thereof.The laying duck feed is prepared from, by weight, 60-80 parts of main materials, 15-20 parts of functional additives and 5-10 parts of auxiliary materials; the functional additive consists of a function enhancing component and a nutrition enhancing component in a mass ratio of (3-5): (0.2-0.5); the main materials comprise corn flour, fermented soybean meal, enzymolysis fish meal and mulberry branch powder; the function strengthening components comprise purple perilla seed powder, dried marine algae powder, lotus leaf powder, dried orange peel powder, garlic powder, Chinese ilex powder and compound probiotics. According to the present invention, by optimizing the feed ratio and adding the functional components to the main material, the egg laying number can be increased, the egg laying period can be prolonged, the cholesterol content of the duck eggs can be reduced, the DHA and selenium content can be increased, and the feed is suitable for various people to eat, and has positive effects on people with cardiovascular diseases.

Description

Technical Field

[0001] The invention belongs to the field of duck feed, and particularly relates to laying duck feed and a preparation method thereof. Background Art

[0002] Laying ducks refer to ducks from the beginning of egg laying to the stage of elimination. With the rapid development of the duck farming industry, the output of duck eggs has also been increasing. Duck eggs are rich in nutrients such as protein, fat, vitamin A, vitamin B2, vitamin D, calcium, iron, phosphorus, etc., which can provide various nutrients needed by the body; the vitamin A and vitamin D contained in them can enhance the body's immunity and improve the ability to resist diseases; the methionine contained in them can help maintain and repair liver tissue and enhance liver function; the rich calcium contained in them can effectively prevent osteoporosis and promote human bone development, etc. It has many functions and is suitable for all kinds of people. However, it also contains high cholesterol. Although cholesterol is an important substance that is indispensable to animal tissue cells, it is involved in the synthesis of bile acid, vitamin D and steroid hormones, etc., but for people who need to control cholesterol intake, eating too many duck eggs is not good.

[0003] Eating duck eggs / chicken eggs every day is very beneficial to the health of normal people. However, for people with underlying diseases such as cardiovascular diseases, long-term intake of duck eggs with high cholesterol content has the risk of aggravating cardiovascular diseases. Therefore, it is necessary to develop a feed that can obtain duck eggs with low cholesterol content and high nutritional content. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a laying duck feed and a preparation method thereof. The laying duck feed optimizes the feed ratio and adds functional ingredients to the main ingredients, which can not only increase the number of eggs laid and extend the egg-laying period, but also reduce the cholesterol content of duck eggs and increase the DHA content. The laying duck feed is suitable for consumption by all kinds of people and also has a positive effect on people with cardiovascular diseases.

[0005] To achieve the above object, the present invention provides a laying duck feed, which comprises the following raw material components by weight: 60-80 parts of main material, 15-20 parts of functional additives and 5-10 parts of auxiliary materials; The functional additives are composed of functional strengthening components and nutritional strengthening components in a mass ratio of 3-5:0.2-0.5; The main ingredients include corn flour, fermented soybean meal, enzymatic fish meal, and mulberry branch powder; The functional strengthening components include perilla seed powder, seaweed powder, lotus leaf powder, tangerine peel powder, garlic powder, holly powder and compound probiotics.

[0006] Furthermore, the main ingredients include, by weight: 40-50 parts of corn flour, 20-40 parts of fermented soybean meal, 10-15 parts of enzymatic fish meal, and 5-10 parts of mulberry branch powder; the enzymatic fish meal is obtained by enzymatically hydrolyzing fish meat and fish bones with pepsin and neutral protease in a mass ratio of 1-2:1. The present invention is mainly based on corn flour, and is more conducive to absorption in combination with fermented soybean meal. The addition of enzymatic fish meal can not only decompose macromolecular proteins into small molecular peptide chains to improve the absorption rate of calcium and phosphorus, but also reduce fishy substances and reduce the enrichment of fishy substances by laying ducks; adding an appropriate amount of mulberry branch powder rich in nutrients such as crude protein, amino acids, and cellulose can provide nutrition, improve the intestinal environment, and reduce costs, improve egg quality and flavor.

[0007] Furthermore, the functional enhancement components include, by weight: 5-8 parts of perilla seed powder, 5-10 parts of seaweed powder, 3-5 parts of lotus leaf powder, 5-8 parts of tangerine peel powder, 2-4 parts of garlic powder, 1-3 parts of holly powder, and 2-5 parts of compound probiotics.

[0008] Perilla seed powder is the seed of perilla, which is rich in nutrients and has the effect of clearing heat and resisting bacteria. The unsaturated fatty acids it contains can promote the decomposition of cholesterol and increase the content of high-density lipoprotein (HDL); seaweed powder is the general name of marine algae, which is rich in iodine and calcium, can enhance the hardness of eggshells, and is also rich in DHA, which can regulate the metabolism of laying ducks and prolong the peak period of egg production; lotus leaf powder is the powder obtained by drying and crushing lotus leaves, which can promote the clear yang and improve loose stools. At the same time, it contains flavonoids that can effectively reduce the cholesterol and triglyceride levels in the blood, thereby preventing the occurrence of cardiovascular diseases. The alkaloids it contains can promote fat metabolism; tangerine peel powder is rich in crude protein and crude fiber. It contains vitamins, iron, zinc, manganese and other trace elements to provide nutrition. At the same time, it can improve digestion, enhance egg-laying performance, and has a special aroma to remove fishy smell and greasiness, thus improving the flavor of eggs. The active ingredients in garlic powder can stimulate the reproductive system of laying ducks, promote the development and maturation of follicles, increase egg production and prolong the egg-laying period. The sulfides (such as allicin) it contains are not only antibacterial and anti-inflammatory, but also can inhibit the activity of HMG-CoA reductase, a key enzyme in cholesterol synthesis in the liver, and reduce the cholesterol content in serum and egg yolk. Holly powder is rich in bioactive substances and can promote the enrichment of DHA in egg yolk. Compound probiotics can regulate intestinal flora, reduce fishy metabolites and improve egg-laying performance and quality.

[0009] The above-mentioned functional enhancement components can not only regulate the reproductive system of laying ducks, promote follicle development, improve their immunity, promote healthy growth, increase egg production and egg-laying cycle, but also reduce the cholesterol content in laying ducks and duck eggs, promote the enrichment of DHA in egg yolks, improve fishy smell, and improve the quality of duck eggs.

[0010] Furthermore, the composite probiotic is a mixture of any proportion of Bacillus subtilis, Lactobacillus plantarum and yeast. Bacillus subtilis can secrete digestive enzymes such as protease and amylase to decompose macromolecular substances that are difficult to absorb in feed, improve feed utilization, and inhibit pathogenic bacteria such as Escherichia coli and Salmonella to maintain the balance of intestinal flora; Lactobacillus plantarum can regulate intestinal immune response and reduce inflammatory response; yeast can secrete mannan, absorb intestinal toxins, and promote intestinal epithelial cell repair. Combining with the above two bacteria, it can not only inhibit cholesterol absorption and promote its conversion into steroids for excretion, but also significantly improve egg production rate and eggshell hardness.

[0011] Furthermore, the nutritional fortification components include organic copper, organic selenium yeast, and sesame oil, and the mass ratio of the organic copper, organic selenium yeast, and sesame oil is 1:1-2:2-4. Copper can participate in the lipid oxidation process as a coenzyme, and adding an appropriate amount can reduce serum cholesterol levels; organic selenium yeast can not only increase the selenium content of duck eggs and improve the quality of duck eggs, but also reduce lipid peroxidation by activating glutathione peroxidase; sesame oil is rich in vitamin E, which can cooperate with citric acid to protect nutrients such as lutein in feed from oxidation, enhance egg yolk quality and indirectly promote egg production, and selenium and vitamin E cooperate to reduce the accumulation of cholesterol oxidation products and improve egg yolk color.

[0012] Furthermore, the auxiliary material includes the following raw material components by weight: 10-20 parts of stone powder, 3-5 parts of citric acid, and 2-3 parts of fructooligosaccharide. Stone powder is the powder after stone grinding, which has a high calcium content, improves the hardness of eggshells, increases grinding efficiency, and promotes absorption; citric acid has the effects of antiseptic, promoting digestion, and anti-oxidation; fructooligosaccharide can regulate intestinal flora, relieve heat stress, and improve lipid metabolism.

[0013] The present invention also provides a method for preparing laying duck feed, comprising the following steps: 1) Take fresh mulberry branches and crush them into particles of 0.5-3mm, then weigh the raw materials of the main ingredients, put them into the blender in turn, add appropriate amount of water and ferment them in a closed container for 5-7 days, and set aside; 2) Preparation of functional additives: crush each raw material to a particle size of 0.5-2 μm, and then add the composite probiotics, seaweed powder, holly powder, lotus leaf powder, garlic powder, perilla seed powder, motherwort powder, and tangerine peel powder into a disc granulator in this order, spray an appropriate amount of water at the same time, and perform disc granulation. Put the granulated functional enhancement components into a low-temperature drying oven for drying and set aside; 3) Mix the raw materials of the nutritional fortification components evenly and set aside; 4) Add the auxiliary materials to the fermented main material in step 1) in sequence, stir evenly, then add the nutritional enhancement component and mix evenly, finally add the functional enhancement component and mix evenly, and then use low-temperature extrusion granulation to obtain laying duck feed.

[0014] Furthermore, in step 1), after adding water, the moisture content in the mixture is 40-50%.

[0015] Furthermore, in step 2), the low-temperature drying temperature is 40-50° C. Low-temperature drying can better preserve the beneficial ingredients from being destroyed.

[0016] Furthermore, in step 4), the process of low-temperature extrusion granulation is as follows: the conveying temperature of the granulator is controlled at 20-40° C., and vacuum freeze drying is performed at a vacuum degree of 20-40 Pa after granulation is completed.

[0017] The beneficial effects of the present invention are as follows: the present invention provides the main energy for the healthy growth of laying ducks with a high utilization rate by rationally proportioning the main ingredients, being nutritious, easy to digest and absorb, and by adding functional strengthening components, the reproductive system of laying ducks can be conditioned to promote follicle development, improve their immunity and egg production, and lipid metabolism can be regulated to prevent cholesterol content enrichment, increase DHA content, and improve egg flavor; while increasing antioxidant capacity and selenium content by adding nutritional strengthening components, cholesterol levels can be further reduced by synergistic action; auxiliary materials can not only appropriately reduce costs, but also promote digestion, and further promote the absorption of nutrients such as DHA. The present invention can not only increase the number of eggs laid and extend the egg-laying period by optimizing the feed proportion of laying ducks, but also reduce the cholesterol content of duck eggs, increase the DHA content, and improve the flavor of duck eggs, which is suitable for consumption by all kinds of people, and also has a positive effect on people with cardiovascular diseases. DETAILED DESCRIPTION

[0018] The experimental methods in the following examples are conventional methods unless otherwise specified. The raw materials involved in the following examples are common commercial products unless otherwise specified and can be purchased from the market. The present invention is further described in detail below in conjunction with the examples: Example 1 A laying duck feed, comprising the following raw material components by weight: 60 parts of main material, 15 parts of functional additives and 5 parts of auxiliary materials; Among them, the functional additives are composed of functional strengthening components and nutritional strengthening components in a mass ratio of 4:0.3; The main ingredients include the following raw material components: 40 parts of corn flour, 20 parts of fermented soybean meal, 12 parts of enzymatic fish meal, and 6 parts of mulberry branch powder; wherein the enzymatic fish meal is obtained by enzymatically hydrolyzing fish meat and fish bones with pepsin and neutral protease in a mass ratio of 2:1; The functional enhancement component includes the following raw material components: 5 parts of perilla seed powder, 7 parts of seaweed powder, 3 parts of lotus leaf powder, 6 parts of tangerine peel powder, 3 parts of garlic powder, 1 part of holly powder, and 2 parts of compound probiotics; wherein the compound probiotics is a mixture of Bacillus subtilis, Lactobacillus plantarum, and yeast in a mass ratio of 1:1:1; The nutritional fortification component is a mixture of organic copper, organic selenium yeast and sesame oil in a mass ratio of 1:1:3; The auxiliary materials include the following raw material components: 10 parts of stone powder, 3 parts of citric acid and 3 parts of fructooligosaccharide.

[0019] The preparation steps are as follows: 1) Take fresh mulberry branches and crush them into particles of 0.5-3mm, then weigh the raw materials of the main ingredients, put them into the blender in turn, add appropriate amount of water to make the moisture content of the mixture 45%, and ferment them in a sealed container for 7 days for later use; 2) Preparation of functional additives: crush each raw material to a particle size of 0.5-2 μm, and then add the compound probiotics, seaweed powder, holly powder, lotus leaf powder, garlic powder, perilla seed powder, and tangerine peel powder into a disc granulator in the order of compound probiotics, spray an appropriate amount of water at the same time, and perform disc granulation. The functional enhancement components after granulation are placed in a low-temperature drying oven at a temperature of 40°C for drying and set aside; 3) Mix the raw materials of the nutritional fortification components evenly and set aside; 4) Add the auxiliary materials to the fermented main material in step 1) in sequence, stir evenly, then add the nutritional enhancement component and mix evenly, finally add the functional enhancement component and mix evenly, adopt low-temperature extrusion granulation, the conveying temperature of the granulator is controlled at 20-40° C. After granulation, vacuum freeze-drying is performed at a vacuum degree of 20 Pa to obtain laying duck feed.

[0020] Example 2 A laying duck feed, comprising the following raw material components by weight: 70 parts of a main material, 18 parts of a functional additive and 7 parts of an auxiliary material; Among them, the functional additives are composed of functional strengthening components and nutritional strengthening components in a mass ratio of 3:0.2; The main ingredients include the following raw material components: 45 parts of corn flour, 30 parts of fermented soybean meal, 10 parts of enzymatic fish meal, and 8 parts of mulberry branch powder; wherein the enzymatic fish meal is obtained by enzymatically hydrolyzing fish meat and fish bones with pepsin and neutral protease in a mass ratio of 2:1; The functional enhancement component includes the following raw material components: 7 parts of perilla seed powder, 10 parts of seaweed powder, 4 parts of lotus leaf powder, 5 parts of tangerine peel powder, 4 parts of garlic powder, 2 parts of holly powder, and 4 parts of compound probiotics; wherein the compound probiotics are a mixture of Bacillus subtilis, Lactobacillus plantarum, and yeast in a mass ratio of 1:1:1; The nutritional fortification component is a mixture of organic copper, organic selenium yeast and sesame oil in a mass ratio of 1:2:4; The auxiliary materials include the following raw material components: 15 parts of stone powder, 4 parts of citric acid and 2 parts of fructooligosaccharide.

[0021] The preparation steps are as follows: 1) Take fresh mulberry branches and crush them into particles of 0.5-3mm, then weigh the raw materials of the main ingredients, put them into the blender in turn, add appropriate amount of water to make the moisture content of the mixture 40%, and ferment them in a sealed container for 6 days for later use; 2) Preparation of functional additives: crush each raw material to a particle size of 0.5-2 μm, and then add the compound probiotics, seaweed powder, holly powder, lotus leaf powder, garlic powder, perilla seed powder, and tangerine peel powder into a disc granulator in the order of the compound probiotics, spray an appropriate amount of water at the same time, and perform disc granulation. The functional enhancement components after granulation are placed in a low-temperature drying oven at a temperature of 45°C for drying and set aside; 3) Mix the raw materials of the nutritional fortification components evenly and set aside; 4) Add the auxiliary materials to the fermented main material in step 1) in sequence, stir evenly, then add the nutritional enhancement component and mix evenly, finally add the functional enhancement component and mix evenly, adopt low-temperature extrusion granulation, the conveying temperature of the granulator is controlled at 20-40° C. After granulation, vacuum freeze-drying is performed at a vacuum degree of 30 Pa to obtain laying duck feed.

[0022] Example 3 A laying duck feed, comprising the following raw material components by weight: 80 parts of main material, 20 parts of functional additives and 10 parts of auxiliary materials; Among them, the functional additives are composed of functional strengthening components and nutritional strengthening components in a mass ratio of 5:0.5; The main ingredients include the following raw material components: 50 parts of corn flour, 40 parts of fermented soybean meal, 15 parts of enzymatic fish meal, and 10 parts of mulberry branch powder; wherein the enzymatic fish meal is obtained by enzymatically hydrolyzing fish meat and fish bones in a mass ratio of 1:1 using pepsin and neutral protease; The functional enhancement component includes the following raw material components: 8 parts of perilla seed powder, 10 parts of seaweed powder, 5 parts of lotus leaf powder, 8 parts of tangerine peel powder, 3 parts of garlic powder, 3 parts of holly powder, and 5 parts of compound probiotics; wherein the compound probiotics is a mixture of Bacillus subtilis, Lactobacillus plantarum, and yeast in a mass ratio of 1:1:1; The nutritional fortification component is a mixture of organic copper, organic selenium yeast and sesame oil in a mass ratio of 1:1:4; The auxiliary materials include the following raw material components: 20 parts of stone powder, 5 parts of citric acid and 3 parts of fructooligosaccharide.

[0023] The preparation steps are as follows: 1) Take fresh mulberry branches and crush them into particles of 0.5-3mm, then weigh the raw materials of the main ingredients, put them into the blender in turn, add appropriate amount of water to make the moisture content of the mixture 50%, and ferment them in a sealed container for 7 days for later use; 2) Preparation of functional additives: crush each raw material to a particle size of 0.5-2 μm, and then add the compound probiotics, seaweed powder, holly powder, lotus leaf powder, garlic powder, perilla seed powder, and tangerine peel powder into a disc granulator in the order of the compound probiotics, spray an appropriate amount of water at the same time, and perform disc granulation. The functional enhancement components after granulation are placed in a low-temperature drying oven at a temperature of 50°C for drying and set aside; 3) Mix the raw materials of the nutritional fortification components evenly and set aside; 4) Add the auxiliary materials to the fermented main material in step 1) in sequence, stir evenly, then add the nutritional enhancement component and mix evenly, finally add the functional enhancement component and mix evenly, adopt low-temperature extrusion granulation, the conveying temperature of the granulator is controlled at 20-40° C. After granulation, vacuum freeze-drying is performed at a vacuum degree of 40 Pa to obtain laying duck feed.

[0024] Comparative Example 1 A laying duck feed, which is different from Example 1 in that the enzymatically hydrolyzed fish meal in the main ingredient is replaced with ordinary fish meal, and the rest is the same as Example 1.

[0025] Comparative Example 2 A laying duck feed, which is different from Example 1 in that mulberry branch powder is not added to the main ingredients, and the rest is the same as Example 1.

[0026] Comparative Example 3 A laying duck feed, which is different from Example 1 in that no perilla seed powder is added to the functional enhancement component, and the rest is the same as Example 1.

[0027] Comparative Example 4 A laying duck feed, which is different from Example 1 in that no seaweed powder is added to the functional enhancement component, and the rest is the same as Example 1.

[0028] Comparative Example 5 A laying duck feed, which is different from Example 1 in that lotus leaf powder is not added to the functional enhancement component, and the other components are the same as Example 1.

[0029] Comparative Example 6 A laying duck feed, which is different from Example 1 in that tangerine peel powder is not added to the function-enhancing component, and the other components are the same as Example 1.

[0030] Comparative Example 7 A laying duck feed, which is different from Example 1 in that garlic powder is not added to the functional enhancement component, and the other components are the same as Example 1.

[0031] Comparative Example 8 A laying duck feed, which is different from Example 1 in that holly powder is not added to the functional enhancement component, and the other components are the same as Example 1.

[0032] Comparative Example 9 A laying duck feed, which is different from Example 1 in that no composite probiotics are added to the functional enhancement component, and the rest is the same as Example 1.

[0033] Comparative Example 10 A laying duck feed, which is different from Example 1 in that Bacillus subtilis is not added to the functional enhancement component, and the other components are the same as Example 1.

[0034] Comparative Example 11 A laying duck feed, which is different from Example 1 in that Lactobacillus plantarum is not added in the functional enhancement component, and the other components are the same as Example 1.

[0035] Comparative Example 12 A laying duck feed, which is different from Example 1 in that yeast is not added to the functional enhancement component, and the rest is the same as Example 1.

[0036] Comparative Example 13 A laying duck feed, which is different from Example 1 in that organic copper is not added to the nutritional fortification component, and the other components are the same as Example 1.

[0037] Comparative Example 14 A laying duck feed, which is different from Example 1 in that organic selenium yeast is not added in the nutritional fortification component, and the other components are the same as Example 1.

[0038] Comparative Example 15 A laying duck feed, which is different from Example 1 in that sesame oil is not added to the nutritional fortification component, and the other components are the same as Example 1.

[0039] Comparative Example 16 A laying duck feed, which is different from Example 1 in that fructooligosaccharide is not added to the auxiliary material, and the rest is the same as Example 1.

[0040] Comparative Example 17 A laying duck feed, which is different from Example 1 in that the main ingredients are not pre-fermented, and the rest are the same as Example 1.

[0041] Comparative Example 18 A laying duck feed, which is the same as Example 1 except that the preparation steps are as follows: 1) Take fresh mulberry branches and crush them into particles of 0.5-3mm, then weigh the raw materials of the main ingredients, put them into the blender in turn, add appropriate amount of water to make the moisture content of the mixture 45%, and ferment them in a sealed container for 7 days for later use; 2) Add the auxiliary materials to the fermented main material in step 1) in sequence, stir evenly, then add the nutritional enhancement components in sequence and mix evenly, then add the functional enhancement components in sequence and mix evenly, adopt low-temperature extrusion granulation, the conveying temperature of the granulator is controlled at 20-40° C. After granulation is completed, vacuum freeze-drying is performed at a vacuum degree of 20 Pa to obtain laying duck feed.

[0042] In order to verify the effect of the laying duck feed prepared by the method of the present invention, the following experiments were conducted: In March 2024, 1980 laying ducks at 100 days of age, about to enter the laying period, were randomly divided into 22 groups (90 in each group, divided into 3 replicate groups) for testing at the company's farm. The laying duck feed prepared in Examples 1-3 and Comparative Examples 1-18 was used as the daily diet, and the pre-test diet (Comparative Example 19) was used as the daily diet. The feeding was pre-fed for 20 days, and then a six-month (183-day) feeding test was conducted. During the pre-feeding and feeding tests, the feeding methods were the same except for the daily diet. The growth, feces discharge, and egg laying of laying ducks were observed, and the weight, eggshell thickness, egg production rate, and taste of duck eggs were tested. At the same time, the DHA, cholesterol, and selenium contents in the egg yolk were tested, and the results are shown in Table 1-3.

[0043] Table 1 Growth of laying ducks

[0044] Table 2 Egg production

[0045] Table 3 Nutrition and sensory properties of duck eggs

[0046] From the results in Tables 1-3, it can be seen that the laying ducks fed with the feed prepared by the laying duck feed formula of the present invention have good growth conditions, strong vitality, no gastrointestinal diseases, long egg laying time, high egg laying rate, average egg weight can reach 98.76g, average eggshell thickness is 0.38-0.40mm, and at the same time, the egg yolk is rich in DHA and selenium, and the cholesterol content is significantly reduced, and the flavor is better. In Comparative Examples 1-18, the laying duck feed lacks one or more raw material components or is prepared by different preparation methods, which affects the growth of laying ducks or the nutritional level of duck eggs to a certain extent.

[0047] In summary, the present invention can not only improve the egg laying rate and extend the egg laying period by optimizing the feed ratio of laying ducks, but also reduce the cholesterol content in duck egg yolks, increase the DHA and selenium contents, and improve the flavor of duck eggs, making the duck eggs suitable for consumption by all kinds of people.

[0048] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A laying duck feed, characterized in that: The raw material components include 60-80 parts of main material, 15-20 parts of functional additives and 5-10 parts of auxiliary materials by weight; The functional additives are composed of functional strengthening components and nutritional strengthening components in a mass ratio of 3-5:0.2-0.5; The main ingredients include corn flour, fermented soybean meal, enzymatic fish meal, and mulberry branch powder; The functional strengthening components include perilla seed powder, seaweed powder, lotus leaf powder, tangerine peel powder, garlic powder, holly powder and compound probiotics.

2. A laying duck feed according to claim 1, characterized in that: The main ingredients include, by weight: 40-50 parts of corn flour, 20-40 parts of fermented soybean meal, 10-15 parts of enzymatic fish meal, and 5-10 parts of mulberry branch powder; the enzymatic fish meal is obtained by enzymatically hydrolyzing fish meat and fish bones with pepsin and neutral protease in a mass ratio of 1-2:

1.

3. A laying duck feed according to claim 1, characterized in that: By weight, the functional enhancement components include: 5-8 parts of perilla seed powder, 5-10 parts of seaweed powder, 3-5 parts of lotus leaf powder, 5-8 parts of tangerine peel powder, 2-4 parts of garlic powder, 1-3 parts of holly powder, and 2-5 parts of compound probiotics.

4. A laying duck feed according to claim 3, characterized in that: The composite probiotics are a mixture of Bacillus subtilis, Lactobacillus plantarum and yeast in any proportion.

5. A laying duck feed according to claim 1, characterized in that: The nutritional fortification components include organic copper, organic selenium yeast and sesame oil; the mass ratio of the organic copper, organic selenium yeast and sesame oil is 1:1-2:2-4.

6. A laying duck feed according to claim 1, characterized in that: In parts by weight, the auxiliary material includes the following raw material components: 10-20 parts of stone powder, 3-5 parts of citric acid, and 2-3 parts of fructooligosaccharide.

7. A method for preparing a laying duck feed according to any one of claims 1 to 6, characterized in that: The steps include: 1) Take fresh mulberry branches and crush them into particles of 0.5-3mm, then weigh the raw materials of the main ingredients, put them into the blender in turn, add appropriate amount of water and ferment them in a closed container for 5-7 days, and set aside; 2) Preparation of functional additives: crush each raw material to a particle size of 0.5-2 μm, and then add the compound probiotics, seaweed powder, holly powder, lotus leaf powder, garlic powder, perilla seed powder, and tangerine peel powder into a disc granulator in the order of the compound probiotics, spray an appropriate amount of water at the same time, and perform disc granulation. Put the granulated functional enhancement components into a low-temperature drying oven for drying and set aside; 3) Mix the raw materials of the nutritional fortification components evenly and set aside; 4) Add the auxiliary materials to the fermented main material in step 1) in sequence, stir evenly, then add the nutritional enhancement component and mix evenly, finally add the functional enhancement component and mix evenly, and then use low-temperature extrusion granulation to obtain laying duck feed.

8. The method for preparing laying duck feed according to claim 7, characterized in that: In step 1), after adding water, the moisture content in the mixture is 40-50%.

9. The method for preparing laying duck feed according to claim 7, characterized in that: In step 2), the low temperature drying temperature is 40-50°C.

10. The method for preparing laying duck feed according to claim 7, characterized in that: In step 4), the process of low-temperature extrusion granulation is as follows: the conveying temperature of the granulator is controlled at 20-40° C., and after the granulation is completed, vacuum freeze drying is performed at a vacuum degree of 20-40 Pa.

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