Pig feed additive composition and preparation method thereof

Abstract

The invention relates to the technical field of feed additives, and discloses a pig feed additive composition and a preparation method thereof, and the preparation method comprises the following preparation steps: mixing and stirring additive raw materials to obtain an additive mixture; performing extrusion puffing treatment on sweet potato powder, mixing the sweet potato powder with the additive mixture, and performing negative pressure treatment to obtain an additive compound; and spraying a mixture formed by glucose, chitosan and zinc caprate to the surface of the additive compound to obtain the pig feed additive composition. The puffed sweet potato powder loaded pig feed additive serves as an inner layer, glucose, chitosan and zinc caprate serve as an outer layer, a double-layer protection mechanism is formed for the pig feed additive, influences of light, heat, oxygen and other environmental factors are avoided, the quality of the pig feed additive can be kept for a long time, and the appetite of pig herds is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of feed additives, and specifically relates to a pig feed additive composition and a preparation method thereof. Background Art

[0002] With the continuous development of the feed industry and the livestock and poultry breeding industry, high-quality pellet feeds are increasingly favored by the market. Pellet feeds have a series of advantages such as comprehensive nutrition, good palatability, shortened feeding time, avoiding picky eating, convenient transportation, storage, and mechanized feeding, and their proportion in the total feed amount is increasing. Among them, pig feed additives refer to various trace substances added to pig feeds, which are used to improve the nutritional value of feeds, promote the growth and health of pigs, and prevent diseases. Adding feed additives to pig diets can promote the intestinal development of pig groups, improve intestinal health, reduce the diarrhea rate, and can also improve the immunity, feed intake, and feed digestibility of pig groups, thereby improving the utilization rate of diets and reducing the feed-to-meat ratio.

[0003] Organic acids, vitamins, and table salt, as pig feed additives, are added to pig diets to supplement the micronutrients of pig groups, improve the appetite of pig groups, reduce the occurrence of diseases in pig groups, and promote the growth of pig groups. However, pig feed additives are easily affected by environmental factors such as light, heat, and oxygen, are easily inactivated, reduce the quality of pig feeds, affect the appetite of pig groups, and the biological utilization rate of additive raw materials is relatively low, affecting the feeding of pig groups and resulting in a reduced weight gain rate. Summary of the Invention

[0004] The present invention provides a pig feed additive composition and a preparation method thereof, which solve the problems of poor biological utilization rate and environmental stability of pig feed additives.

[0005] The technical solution of the present invention: A preparation method of a pig feed additive composition includes the following preparation steps: S1. Mix and stir the additive raw materials to obtain an additive mixture. S2. After extruding and puffing sweet potato powder, mix it with the additive mixture, and perform negative pressure treatment to obtain an additive complex. Among them, the sweet potato powder is extruded and puffed by a twin-screw extruder, bubbles overflow on the sweet potato powder, and then a porous structure is generated on the sweet potato powder to obtain expanded sweet potato powder; the expanded sweet potato powder and the additive mixture are mixed, and after negative pressure treatment, the additive mixture is adsorbed into the porous structure of the expanded sweet potato powder to obtain an additive complex.

[0006] S3. Coating glucose, chitosan, and zinc caprylate on the surface of the additive complex to obtain a pig feed additive composition.

[0007] Further, in step S1, the additive raw materials include the following raw materials by mass: 8-12 parts of taurine, 6-10 parts of vitamin C, 4-8 parts of glycine, 1-2 parts of γ-aminobutyric acid, 6-10 parts of citric acid, 0.4-0.6 parts of vitamin core material, 3-7 parts of sodium chloride, and 0.1-0.5 parts of potassium chloride.

[0008] Further, the vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid, and folic acid mixed in a mass ratio of (4-6):(8-12):(4-6):(0.8-1.2):(45-55):(14-16):(0.8-1.2).

[0009] Further, in step S2, twin-screw extruder is used for extrusion and puffing, the temperature is 100-110 °C, the screw speed is 150-200 r / min, the deionized water flow rate is 500-520 g / h, and the feeding speed is 600-620 g / h.

[0010] Further, in step S2, the negative pressure treatment pressure is -0.02 MPa.

[0011] Further, in step S2, the mass ratio of the additive mixture to sweet potato powder is (5-8):(10-15).

[0012] Further, in step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose, chitosan solution, and zinc caprylate, stir evenly, adjust the pH to 5-6, and continue stirring at 40-50 °C for 30-40 min to obtain a mixture; A2. Spray the mixture onto the surface of the additive complex, and shake evenly to obtain the pig feed additive composition.

[0013] Further, during the reaction process of A1 above, the active groups contained in chitosan can combine with the oxygen-containing functional groups of glucose through chemical bonds, and chitosan and glucose can complex with the zinc ions in zinc caprylate to form a mixture.

[0014] Further, during the reaction process of A2 above, when the mixture is sprayed onto the surface of the additive complex, chitosan has good film-forming properties, so that a chitosan film structure can be formed on the surface of the additive complex, realizing the coating of chitosan, glucose, and zinc caprylate on the surface of the additive complex to obtain the pig feed additive composition.

[0015] Further, in step A1, the mass ratio of glucose, chitosan solution, and zinc caprylate is (1.1-1.3):(65-75):(1-1.2).

[0016] Further, in step A1, the chitosan solution is prepared by mixing chitosan and acetic acid in a mass ratio of (2-5):(80-100).

[0017] Further, in step A2, the mass ratio of the additive complex to the mixture is 1:(0.1-0.3).

[0018] Further, in step A2, spraying is carried out using a spray dryer, the spray pressure is 0.2-0.5 MPa, and the inlet air temperature is 80-100 °C.

[0019] Among them, using a spray dryer to spray the mixture onto the surface of the additive complex can prevent the additive complex from sticking.

[0020] Further, in step A2, the oscillation rate is 100-300 r / min, and the oscillation time is 10-20 min.

[0021] Further, the present invention also includes a pig feed additive composition prepared by a preparation method of a pig feed additive composition.

[0022] The present invention has the following beneficial effects: (1) In the technical solution of the present invention, the additive mixture is adsorbed into the porous structure of the expanded sweet potato powder. On the one hand, the expanded sweet potato powder loaded with the additive mixture can improve the stability of the additive mixture, avoid the additive raw materials from losing activity under environmental factors such as light, heat, and oxygen, affecting the quality of the pig feed additive composition and resulting in a decrease in the appetite of the pig group. On the other hand, the expanded sweet potato powder, as a carrier of the additive raw materials, can slowly release the additive raw materials and improve the bioavailability of the additive raw materials.

[0023] (2) In the technical solution of the present invention, the mixture formed by glucose, chitosan and zinc caprylate is sprayed onto the surface of the additive complex. On the one hand, glucose, as a pig feed additive, can provide energy and nutrition, stimulate the active transport of pig intestinal epithelial cells, and accelerate the absorption of the components in the additive complex. Moreover, the chitosan film can inhibit the growth of Aspergillus flavus, Aspergillus niger, etc., reduce the mildew of sweet potato powder in the additive complex, and improve the storage stability of the additive mixture. On the other hand, zinc caprylate has excellent hydrophobic properties and adheres to the surface of the additive complex through chitosan to form a moisture-proof barrier, reducing the direct contact of moisture with sweet potato powder, avoiding the easy moisture absorption and caking of sweet potato powder in the additive complex, which leads to the decline of the stability of the additive raw materials and affects the quality of the feed additive. In addition, zinc caprylate provides trace element zinc ions, which can improve the intestinal barrier function, increase the appetite of the pig group, and promote the growth of the pig group. In addition, the expanded sweet potato powder loaded with pig feed additive as the inner layer and glucose, chitosan and zinc caprylate as the outer layer form a double-layer protection mechanism for the pig feed additive, avoiding the influence of environmental factors such as light, heat and oxygen, and can maintain the quality of the pig feed additive for a long time, increasing the appetite of the pig group.

[0024] (3) In the technical solution of the present invention, in the additive mixture, taurine can improve the synthesis of proteins and energy metabolism in the pig body, enhance the utilization efficiency of the feed, and taurine can also enhance the antioxidant capacity and immune cell function in the pig body, reduce the disease risk, and have a positive impact on the immune function of pigs; glycine, γ-aminobutyric acid, and citric acid, as organic acids, can promote the growth of the pig group, improve the intestinal health of the pig group, and increase the utilization rate of the feed by the pig group; adding citric acid has a positive impact on the digestibility of pig proteins, calcium and phosphorus; Vitamin C, as a pig feed additive, can effectively slow down the reaction of the pig group under environmental stress, pathological stress and nutritional stress, reduce the occurrence of diseases caused by stress, and can improve the immune function of pigs and promote the growth of the pig group; sodium chloride and potassium chloride can effectively increase the content of sodium and chlorine in the pig body, and the intake of salt can promote the secretion of digestive juices in the pig body and increase the appetite of pigs; Vitamin B1, Vitamin B2, Vitamin B6, Vitamin B12, niacin, pantothenic acid, and folic acid contained in the vitamin core material can supplement the micronutrients of the pig group, increase the appetite of the pig group, reduce the occurrence of diseases in the pig group, and promote the growth of the pig group. Specific Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] In the embodiments of the present invention, the raw materials used are as follows, and all the reagents used are of analytical grade.

[0027] Among them, the chitosan solution is prepared by mixing chitosan and acetic acid in a mass ratio of 3.5:90.

[0028] The degree of deacetylation of chitosan is 80%.

[0029] Example 1 A preparation method of a pig feed additive composition includes the following preparation steps: S1. Mix the additive raw materials and stir at 60 r / min for 10 min to obtain an additive mixture; S2. After extruding and puffing sweet potato powder, mix it with the additive mixture and perform negative pressure treatment to obtain an additive complex; S3. Coating glucose, chitosan, and zinc caprylate on the surface of the additive complex to obtain a pig feed additive composition.

[0030] Among them, in step S1, the additive raw materials include the following raw materials in parts by mass: 8 parts of taurine, 6 parts of vitamin C, 4 parts of glycine, 1 part of γ-aminobutyric acid, 6 parts of citric acid, 0.4 part of vitamin core material, 3 parts of sodium chloride, and 0.1 part of potassium chloride; The vitamin core material is prepared by mixing vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid, and folic acid in a mass ratio of 4:8:4:0.8:45:14:0.8; In step S2, a twin-screw extruder is used for extrusion and puffing, the temperature is 100 °C, the screw speed is 150 r / min, the deionized water flow rate is 500 g / h, and the feeding speed is 600 g / h; The negative pressure treatment pressure is -0.02 MPa; In step S2, the mass ratio of the additive mixture to sweet potato powder is 5:10.

[0031] In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose, chitosan solution, and zinc caprylate, stir evenly, adjust the pH to 5, and continue stirring at 40 °C for 30 min to obtain a mixture; among them, the mass ratio of glucose, chitosan solution, and zinc caprylate is 1.1:65:1; A2. Spray the mixture onto the surface of the additive complex and shake evenly to obtain a pig feed additive composition; among them, the mass ratio of the additive complex to the mixture is 1:0.1; spraying is carried out using a spray dryer, the spray pressure is 0.3 MPa, and the inlet air temperature is 80 °C; the shaking rate is 200 r / min, and the shaking time is 15 min.

[0032] Example 2 A preparation method of a pig feed additive composition, comprising the following preparation steps: S1. Mix the additive raw materials and stir at 60 r / min for 10 min to obtain an additive mixture; S2. After extruding and puffing sweet potato powder, mix it with the additive mixture and perform negative pressure treatment to obtain an additive complex; S3. Coating glucose, chitosan and zinc caprylate on the surface of the additive complex to obtain a pig feed additive composition.

[0033] Among them, in step S1, the additive raw materials include the following raw materials in parts by mass: 10 parts of taurine, 8 parts of vitamin C, 6 parts of glycine, 1.5 parts of γ-aminobutyric acid, 8 parts of citric acid, 0.5 part of vitamin core material, 5 parts of sodium chloride, 0.3 part of potassium chloride; The vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid and folic acid mixed in a mass ratio of 5:10:5:1:50:15:1; In step S2, the extrusion and puffing is carried out by a twin-screw extruder, the temperature is 105 °C, the screw speed is 180 r / min, the deionized water flow rate is 510 g / h, and the feeding speed is 610 g / h; The negative pressure treatment pressure is -0.02 MPa; In step S2, the mass ratio of the additive mixture to the sweet potato powder is 6.5:13.

[0034] In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose, chitosan solution and zinc caprylate, stir evenly, adjust the pH to 5.5, and continue stirring at 45 °C for 35 min to obtain a mixture; among them, the mass ratio of glucose, chitosan solution and zinc caprylate is 1.2:70:1.1; A2. Spray the mixture onto the surface of the additive complex and shake evenly to obtain a pig feed additive composition; among them, the mass ratio of the additive complex to the mixture is 1:0.2; the spraying is carried out by a spray dryer, the spray pressure is 0.3 MPa, and the inlet air temperature is 90 °C; the shaking rate is 200 r / min, and the shaking time is 15 min.

[0035] Example 3 A preparation method of a pig feed additive composition, comprising the following preparation steps: S1. Mix the additive raw materials and stir at 60 r / min for 10 min to obtain an additive mixture; S2. After extruding and puffing sweet potato powder, mix it with the additive mixture and perform negative pressure treatment to obtain an additive complex; S3. Coating glucose, chitosan, and zinc caprylate on the surface of the additive complex to obtain the pig feed additive composition.

[0036] Among them, in step S1, the additive raw materials include the following raw materials by mass: 12 parts of taurine, 10 parts of vitamin C, 8 parts of glycine, 2 parts of γ-aminobutyric acid, 10 parts of citric acid, 0.6 part of vitamin core material, 7 parts of sodium chloride, and 0.5 part of potassium chloride; The vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid, and folic acid mixed in a mass ratio of 6:12:6:1.2:55:16:1.2; In step S2, twin-screw extrusion is used, the temperature is 110 °C, the screw speed is 200 r / min, the deionized water flow rate is 520 g / h, and the feeding speed is 620 g / h; The negative pressure treatment pressure is -0.02 MPa; In step S2, the mass ratio of the additive mixture to sweet potato powder is 8:15.

[0037] In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose, chitosan solution, and zinc caprylate, stir evenly, adjust the pH to 6, and continue stirring at 50 °C for 40 min to obtain a mixture; among them, the mass ratio of glucose, chitosan solution, and zinc caprylate is 1.3:75:1.2; A2. Spray the mixture onto the surface of the additive complex, shake evenly to obtain the pig feed additive composition; among them, the mass ratio of the additive complex to the mixture is 1:0.3; spraying is carried out using a spray dryer, the spray pressure is 0.3 MPa, the inlet air temperature is 100 °C; the shaking rate is 200 r / min, and the shaking time is 15 min.

[0038] Comparative Example 1 A preparation method of a pig feed additive composition includes the following preparation steps: S1. Mix the additive raw materials and stir at 60 r / min for 10 min to obtain an additive mixture; S2. Mix sweet potato powder with the additive mixture and perform negative pressure treatment to obtain an additive complex; S3. Coating glucose, chitosan, and zinc caprylate on the surface of the additive complex to obtain the pig feed additive composition.

[0039] Among them, in step S1, the additive raw materials include the following raw materials by mass: 12 parts of taurine, 10 parts of vitamin C, 8 parts of glycine, 2 parts of γ-aminobutyric acid, 10 parts of citric acid, 0.6 part of vitamin core material, 7 parts of sodium chloride, and 0.5 part of potassium chloride; The vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid and folic acid mixed according to a mass ratio of 6:12:6:1.2:55:16:1.2; The negative pressure treatment pressure is -0.02 MPa; In step S2, the mass ratio of the additive mixture to sweet potato powder is 8:15.

[0040] In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose, chitosan solution and zinc caprylate, stir evenly, adjust the pH to 6, and continue stirring at 50 °C for 40 min to obtain a mixture; wherein, the mass ratio of glucose, chitosan solution, and zinc caprylate is 1.3:75:1.2; A2. Spray the mixture onto the surface of the additive complex, shake evenly to obtain the pig feed additive composition; wherein, the additive complex and the mixture are in a ratio of 1:0.3; spraying is carried out using a spray dryer, the spray pressure is 0.3 MPa, the inlet air temperature is 100 °C; the shaking rate is 200 r / min, and the shaking time is 15 min.

[0041] Comparative Example 2 A preparation method of a pig feed additive composition includes the following preparation steps: S1. Mix the additive raw materials and stir at 60 r / min for 10 min to obtain an additive mixture; S2. After the sweet potato powder is subjected to extrusion puffing treatment, it is mixed with the additive mixture and subjected to negative pressure treatment to obtain an additive complex; S3. Coating chitosan and zinc caprylate on the surface of the additive complex to obtain the pig feed additive composition.

[0042] Among them, in step S1, the additive raw materials include the following raw materials in parts by mass: 12 parts of taurine, 10 parts of vitamin C, 8 parts of glycine, 2 parts of γ-aminobutyric acid, 10 parts of citric acid, 0.6 part of vitamin core material, 7 parts of sodium chloride, 0.5 part of potassium chloride; The vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid and folic acid mixed according to a mass ratio of 6:12:6:1.2:55:16:1.2; In step S2, the extrusion puffing is carried out using a twin-screw extruder, the temperature is 110 °C, the screw speed is 200 r / min, the deionized water flow rate is 520 g / h, and the feeding speed is 620 g / h; The negative pressure treatment pressure is -0.02 MPa; In step S2, the mass ratio of the additive mixture to sweet potato powder is 8:15.

[0043] In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix the chitosan solution and zinc caprylate, stir evenly, adjust the pH to 6, and continue stirring at 50 °C for 40 min to obtain a mixture; wherein, the mass ratio of the chitosan solution to zinc caprylate is 75:2.5; A2. Spray the mixture onto the surface of the additive complex, shake evenly to obtain the pig feed additive composition; wherein, the additive complex and the mixture are in a ratio of 1:0.3; The spraying is carried out using a spray dryer, the spray pressure is 0.3 MPa, and the inlet air temperature is 100 °C; The shaking rate is 200 r / min, and the shaking time is 15 min.

[0044] Comparative Example 3 A preparation method of a pig feed additive composition includes the following preparation steps: S1. Mix the additive raw materials and stir at 60 r / min for 10 min to obtain an additive mixture; S2. After extruding and puffing sweet potato powder, mix it with the additive mixture and perform negative pressure treatment to obtain an additive complex; S3. Coating glucose and chitosan on the surface of the additive complex to obtain the pig feed additive composition.

[0045] Among them, in step S1, the additive raw materials include the following raw materials in parts by mass: 12 parts of taurine, 10 parts of vitamin C, 8 parts of glycine, 2 parts of γ-aminobutyric acid, 10 parts of citric acid, 0.6 part of vitamin core material, 7 parts of sodium chloride, and 0.5 part of potassium chloride; The vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid, and folic acid mixed in a mass ratio of 6:12:6:1.2:55:16:1.2; In step S2, the extrusion and puffing are carried out using a twin-screw extruder, the temperature is 110 °C, the screw speed is 200 r / min, the deionized water flow rate is 520 g / h, and the feeding speed is 620 g / h; The negative pressure treatment pressure is -0.02 MPa; In step S2, the mass ratio of the additive mixture to sweet potato powder is 8:15.

[0046] In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose and chitosan solution, stir evenly, adjust the pH to 6, and continue stirring at 50 °C for 40 min to obtain a mixture; wherein, the mass ratio of glucose to chitosan solution is 2.5:75; A2. Spray the mixture onto the surface of the additive complex and shake evenly to obtain the pig feed additive composition; wherein, the additive complex and the mixture are in a ratio of 1:0.3; the spraying is carried out using a spray dryer, the spray pressure is 0.3 MPa, and the inlet air temperature is 100 °C; the shaking rate is 200 r / min and the shaking time is 15 min.

[0047] Comparative Example 4 A preparation method of a pig feed additive composition includes the following preparation steps: S1. Mix the additive raw materials and stir at 60 r / min for 10 min to obtain the additive mixture; S2. After extruding and puffing sweet potato powder, mix it with the additive mixture and perform negative pressure treatment to obtain the additive complex; S3. Coating glucose and zinc caprylate on the surface of the additive complex to obtain the pig feed additive composition.

[0048] Among them, in step S1, the additive raw materials include the following raw materials by mass: 12 parts of taurine, 10 parts of vitamin C, 8 parts of glycine, 2 parts of γ-aminobutyric acid, 10 parts of citric acid, 0.6 part of vitamin core material, 7 parts of sodium chloride, 0.5 part of potassium chloride; The vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid and folic acid mixed in a mass ratio of 6:12:6:1.2:55:16:1.2; In step S2, the extrusion and puffing is carried out using a twin-screw extruder, the temperature is 110 °C, the screw speed is 200 r / min, the deionized water flow rate is 520 g / h, and the feeding speed is 620 g / h; The negative pressure treatment pressure is -0.02 MPa; In step S2, the mass ratio of the additive mixture to sweet potato powder is 8:15.

[0049] In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose, acetic acid and zinc caprylate, stir evenly, adjust the pH to 6, and continue stirring at 50 °C for 40 min to obtain the mixture; wherein, the mass ratio of glucose, acetic acid and zinc caprylate is 1.3:75:1.2; A2. Spray the mixture onto the surface of the additive complex and shake evenly to obtain the pig feed additive composition; wherein, the additive complex and the mixture are in a ratio of 1:0.3; the spraying is carried out using a spray dryer, the spray pressure is 0.3 MPa, and the inlet air temperature is 100 °C; the shaking rate is 200 r / min and the shaking time is 15 min.

[0050] The performance of the pig feed additive compositions prepared in Examples 1-3 and Comparative Examples 1-4 was detected.

[0051] Forty three-way pigs (half male and half female) with an average body weight of 28 kg were randomly divided into 8 groups of 5 pigs each, namely the blank control group, the groups of Examples 1-3, and the groups of Comparative Examples 1-4. The blank control group only ate pig feed (the pig feed was composed of corn, soybean meal, and wheat bran with a mass ratio of 4:1.5:2.5). The groups of Examples 1-3 and the groups of Comparative Examples 1-4 ate pig feed added with the above-prepared pig feed additive composition, and the proportion of the pig feed additive composition was 2%.

[0052] Specific method: The Northeast Spotted pigs were allowed to eat and drink freely, immunized and dewormed conventionally, and the test period was 90 days.

[0053] Daily feed intake: Record the feeding amount and remaining amount of the test pigs in each pen, and calculate the average daily feed intake per pig; daily weight gain: The test pigs were weighed on an empty stomach at 7:30 every morning, and the average daily weight gain per pig was calculated; feed to gain ratio = feed intake / weight gain.

[0054] The test results are shown in Table 1 below.

[0055] Table 1 Performance detection of the pig feed additive compositions prepared in Examples 1-3 and Comparative Examples 1-4

[0056] It can be seen from the data in Table 1 that the pig feed additive compositions prepared in Examples 1-3 can significantly improve the appetite and growth performance of the pig group.

[0057] Comparative Example 1 is the pig feed additive composition prepared by the sweet potato powder in step S1 without extrusion and puffing treatment. The growth performance of the pig group decreased, which proved that the puffed sweet potato powder loaded with the additive mixture can improve the stability of the additive mixture, avoid the additive raw materials from being easily inactivated under environmental factors such as light, heat, and oxygen, affecting the quality of the pig feed additive composition and resulting in a decrease in the appetite of the pig group. On the other hand, the puffed sweet potato powder as the carrier of the additive raw materials can slowly release the additive raw materials and improve the biological utilization rate of the additive raw materials.

[0058] Comparative Example 2 is the pig feed additive composition prepared by replacing glucose with zinc caprylate in equal mass in step S3, Comparative Example 3 is the pig feed additive composition prepared by replacing zinc caprylate with glucose in equal mass in step S3, and Comparative Example 4 is the pig feed additive composition prepared by replacing the chitosan solution with acetic acid in step S3. The growth performance of the pig group decreased, which proved that chitosan, glucose, and zinc caprylate coated on the surface of the additive complex can reduce the mildew of the sweet potato powder in the additive complex, improve the storage stability of the additive mixture, and improve the appetite of the pig group and promote the growth of the pig group.

[0059] In the description of the specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above content is only an illustration and explanation of the present invention. Those skilled in the art to which the present technology pertains may make various modifications or supplements to the described specific embodiments or use similar ways for substitution, as long as they do not deviate from the invention or exceed the scope defined by the claims of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A preparation method of a pig feed additive composition, characterized in that, It includes the following preparation steps: S1. Mix the additive raw materials and stir to obtain an additive mixture; S2. After subjecting sweet potato powder to extrusion and puffing treatment, mix it with the additive mixture and perform negative pressure treatment to obtain an additive complex; S3. Spray the mixture formed by glucose, chitosan and zinc caprylate onto the surface of the additive complex to obtain a pig feed additive composition.

2. The preparation method of a pig feed additive composition according to claim 1, characterized in that, In step S1, the additive raw materials include the following raw materials in parts by mass: 8-12 parts of taurine, 6-10 parts of vitamin C, 4-8 parts of glycine, 1-2 parts of γ-aminobutyric acid, 6-10 parts of citric acid, 0.4-0.6 part of vitamin core material, 3-7 parts of sodium chloride, and 0.1-0.5 part of potassium chloride.

3. The preparation method of a pig feed additive composition according to claim 2, characterized in that, The vitamin core material is composed of vitamin B1, vitamin B2, vitamin B6, vitamin B12, nicotinic acid, pantothenic acid and folic acid mixed in a mass ratio of (4-6):(8-12):(4-6):(0.8-1.2):(45-55):(14-16):(0.8-1.2).

4. The preparation method of a pig feed additive composition according to claim 1, characterized in that, In step S2, the extrusion and puffing is carried out using a twin-screw extruder, the temperature is 100-110 °C, the screw rotation speed is 150-200 r / min, the deionized water flow rate is 500-520 g / h, and the feeding speed is 600-620 g / h.

5. The preparation method of a pig feed additive composition according to claim 1, characterized in that, In step S2, the mass ratio of the additive mixture to sweet potato powder is (5-8):(10-15).

6. The preparation method of a pig feed additive composition according to claim 1, characterized in that, In step S3, the pig feed additive composition is specifically prepared by the following steps: A1. Mix glucose, chitosan solution and zinc caprylate, stir evenly, adjust the pH to 5-6, and continue stirring at 40-50 °C for 30-40 min to obtain a mixture; A2. Spray the mixture onto the surface of the additive complex and shake evenly to obtain a pig feed additive composition.

7. The preparation method of a pig feed additive composition according to claim 6, characterized in that, In step A1, the mass ratio of glucose, chitosan solution and zinc caprylate is (1.1-1.3):(65-75):(1-1.2).

8. The preparation method of a pig feed additive composition according to claim 6, characterized in that, In step A1, the chitosan solution is composed of chitosan and acetic acid mixed in a mass ratio of (2-5):(80-100).

9. The preparation method of a pig feed additive composition according to claim 6, characterized in that, In step A2, the mass ratio of the additive complex to the mixture is 1:(0.1-0.3).

10. A pig feed additive composition prepared by the preparation method of the pig feed additive composition according to any one of claims 1-9.

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