Soy peptide is a peptide mixture composed of 2 to 6 amino acid residues and having a molecular weight of 200 to 800 Da after hydrolysis of soybean protein. Compared with the original protein, soy peptide has good water solubility and can be completely dissolved under any acid-base condition of pH 2-10. Soy peptide contains essential amino acids required by humans and animals, compared with amino acids of the same composition. Soy peptides are more easily absorbed by humans and animals. They can be directly absorbed into the small intestine without digestion by the stomach. China's research on soybean peptides is relatively late, and basic research is weak, but in recent years, research has gradually become active. Mainly used in the food industry, the breeding industry has also begun to appear soy protein feed. This paper reviews the effects of soy peptides on nutrient conversion in diets and their applications in animal production. Provide a theoretical basis for the application of soy peptides in the aquaculture industry. 1 The effect of soy peptide on the conversion of various nutrients in the diet 1.1 Soy peptide can accelerate protein synthesis The supply form of dietary amino acids affects the protein metabolism of animals. Traditional nutrition believes that protein nutrition in monogastric animals is amino acid nutrition, and the quality of feed protein depends on the state of each amino acid in the feed. However, many experiments have shown that the addition of sufficient essential amino acids to low protein diets still does not achieve the desired results. When soybean peptide is used as the nitrogen source, the overall protein deposition rate is higher than that of the corresponding amino acid-based diet. The reason is that the soybean peptide is transported in the intestinal tract faster, can alleviate the competition of intestinal wall cells for amino acid intake, and the soybean peptide is also It can promote the transport of amino acids in the intestine. Studies have shown that small peptides in the blood circulation can directly participate in the synthesis of tissue proteins. In addition, small peptides can be utilized in tissues such as liver, kidney, and skin. Rerat et al. (1998) reported that after porcine duodenal perfusion of small peptides, the level of insulin in plasma was higher than that in the perfused free amino acid group, and insulin was involved in the extension of the peptide chain during protein synthesis, thereby promoting protein synthesis. 1.2 Soy peptide can promote fat metabolism Animal experiments have shown that soy peptide can promote fat metabolism and lower blood lipids and cholesterol. Some experts have used the swimming swimming load test of mice to find that the administration of soybean peptide can increase the exercise tolerance of mice and reduce the intra-abdominal fat content of mice. Some experts have used rats to confirm that soy peptide can increase the metabolism of adipose tissue, increase energy metabolism and heat production, and reduce fat storage in the body. 1.3 Soy peptide can promote mineral absorption Phytic acid, oxalic acid, tannin and other mineral elements in soy protein precipitate with mineral elements such as calcium, iron and zinc in the intestine, thereby affecting the bioavailability of mineral elements in the feed, and the amino acid residues of the soybean peptide can be combined with metals. Ion chelation prevents the precipitation and adsorption of mineral elements by antagonistic factors and other factors in the intestinal lumen, directly reaches the brush border of the small intestine, and hydrolyzes at the absorption site, increasing the absorption rate of mineral elements and reducing the mineral elements in the feed. The amount of addition, thereby promoting bone growth, improve eggshell quality, reduce the incidence of postpartum sputum and osteoporosis in livestock and poultry, and reduce farming costs and environmental pollution. 1.4 Soy peptides are beneficial to carotenoids in livestock and poultry products. Studies have shown that the addition of soy peptide in the feed of 60-week-old Hainan grey hens found that the addition of 0.2% soy peptide in the feed increased the egg yellowness by 41.94%, the carotenoid content by three times, and the egg yolk was golden yellow. The texture is soft, the taste is strong, and the taste is excellent. 2 Soy peptides in animal production 2.1 Soy peptide can reduce the diarrhea rate of livestock and poultry, improve the survival rate of When the amino acid in the diet is too high, the osmotic pressure of the nutrient solution is higher than that of the body fluid, so that the water in the tissue cells of the livestock and poultry will move to the gastrointestinal tract, and the nutrients will be deteriorated and absorbed, thereby causing diarrhea in the animal. However, the soy peptide osmotic pressure is lower than that of amino acids. When the soybean peptide is added to the diet, the diarrhea of ​​the livestock and poultry can be reduced. In addition, soybean peptide removes soybean antigen and anti-nutritional factors in the production process, which can promote the development of intestinal villi in young animals and adjust the structure of microbial flora in digestive tract. Zhao Fangfang and Zhang Rijun (2004) showed that the addition of soy peptide in chicken feed can increase the chicken sac, jejunum, cecum and rectal lactic acid bacteria by more than 10 times, while the total number of E. coli and aerobic bacteria decreased by more than 10 times. Yamauchi et al. (1993) showed that piglets fed 4 weeks of soy peptide significantly increased the weight of the spleen and thymus. Therefore, soy peptide can play a dual role of nutrition and disease resistance, thereby ensuring healthy growth of animals and increasing survival rate. Liu Fuxing and Feng Xiaoshuang (2006) in the Qinggang Pioneer Breeding Farm in Suihua City showed that 1.0% of a commercial soybean peptide was added during the nursery period, and the diarrhea rate of piglets decreased by 43.8%. Studies in the Mudanjiang Dawan breeding farm showed that 1.0% of a commercial soy peptide was added to the feed from the start of feeding to 35 days of age. The survival rate during the feeding period was 7.44 percentage points higher than that of the control group; 0.5% of the commercial soybean peptide was added from 36 to 70 days old; the survival rate in the conservation stage increased by 4.61 percentage points. Wall-Mounted Basin Faucets,Wall Mounted Bathroom Faucet,Wall-Mounted Faucets For Modern Basin,Wall Mounted Concealed Basin Faucet Kaiping Jenor Sanitary Ware Co., Ltd , https://www.kpjenorsanitary.com