Benefits of adding yeast to poultry diets

Yeast is one of the earliest known microorganisms. It is a non-photosynthetic, high-grade, active single-cell fungus with two modes of budding and proliferative, larger than bacteria. There are currently more than 700 known yeasts, but only a few yeasts are known. The term "yeast" is commonly used as a synonym for Saccharomyces cerevisiae, and research on yeast has been carried out in many ways, and it has been widely used in industrial production. Saccharomyces cerevisiae has identified more than a thousand strains of yeast, and most members of the genus Saccharomyces are considered safe (GRAS). They ferment large amounts of carbohydrates and sugars, such as glucose, fructose, mannose, galactose, sucrose, maltose, raffinose, etc., to produce metabolites dominated by alcohol and carbon dioxide. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Yeast cell clumps are a good source of vitamin B and trace minerals. As a single-cell protein resource, applications have been quite extensive for some time. The single cell component from yeast depends on the enzymatic substrate used. If molasses is used, it contains approximately 50-52% protein and can be fed to broilers and laying hens at 2-5% and 10%, respectively. Recently, the use of yeast has mainly utilized its degradation of fibrous feeds such as cornstalks, wheat straws, dusts, and the like, as well as molecular or genetic methods to produce industrial alcohols to utilize their products. This opens up the possibility of mass production of single-cell proteins in the future. Yeast has many benefits as a feed additive for poultry. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Improve production performance 5zj China feed industry information network - based on feed, service animal husbandry

Traditional methods use yeast as a growth promoting additive for poultry and other animals. Normally, yeast does not multiply in the digestive tract and disappears soon after it enters the intestine. The main effects of adding yeast are: 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

l Stimulate brush border disaccharidase 5zj China feed industry information network - based on feed, service animal husbandry

l Stop the pathogen adsorption 5zj China feed industry information network - based on feed, service animal husbandry

l stimulate non-specific immunity 5zj China feed industry information network - based on feed, service animal husbandry

l resistance to pathogenic microorganisms and toxins inhibiting 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Summary Several feeding trials have shown that adding 2-3 g/kg of yeast to broiler feed can effectively promote its growth and improve feed efficiency. It is clear that yeast has a good effect on nutrient retention. Adding yeast to the feed can reduce the mortality of broiler flocks due to non-specific pathogenic causes. Yeast has also been shown to be as effective as antibiotics in promoting broiler growth (Table 1). Yeast is an effective alternative when antibiotics are used as growth promoters. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Antioxidant properties 5zj China feed industry information network - based on feed, service animal husbandry

The antioxidant factors identified by Saccharomyces cerevisiae are glucose tolerance factor fragments and superoxide dismutase. The presence of water-soluble α-glucose derivatives in yeast cells can effectively eliminate free radicals in chickens. These functions of yeast combined with its ability to transfer oxidized fats or fatty acids allow the poultry to prolong the stability of oxidation during storage. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Improve heat stress 5zj China feed industry information network - based on feed, service animal husbandry

Some people think that yeast can promote the absorption of nutrients in the intestinal wall by positively affecting the intestinal flora, so yeast can help reduce the heat stress of the flock. The goblet cells on the intestinal wall secrete mucus to participate in the absorption of nutrients and nourish the intestinal flora. In summary, a large number of goblet cells are reduced during heat stress, while yeast can increase the number of goblet cells. The effect is more pronounced when yeast is added with antibiotics such as bacitracin. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Promote digestion 5zj China feed industry information network - based on feed, service animal husbandry

The contents of the yeast cells are released by hydrolysis of enzymes and acids in the cell wall. These inclusions are rich in water-soluble vitamins, minerals, peptides and amino acids (mainly glutamic acid and aspartic acid). These free amino acids can reach 35-40%. The presence of aromatic amino acids can make food. It has an aromatic flavor and these nutrients may prove to stimulate the liver to promote digestion in the future. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Trace mineral activity 5zj China feed industry information network - based on feed, service animal husbandry

The presence of certain essential trace minerals in inorganic form is not very effective for birds, but it can be effectively solved by the organic form of the chelation of organic molecules. Selenium and chromium can penetrate into yeast cells during yeast growth. When selenium is mixed with organic matter, it is easily assimilated and more effective as an antioxidant. Similarly, chromium-rich yeast can reduce carcass fat deposition and mortality in broilers. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Balanced intestinal flora 5zj China feed industry information network - based on feed, service animal husbandry

The yeast cell wall is a rich and beneficial source of mixed carbohydrates, containing 46% dextran and 43% mannan, which help build a healthy gut flora. Improves immunity, improves meat quality, and resists mycotoxins. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Recently, carbohydrate multimers from the cell wall of S. cerevisiae members have received more attention due to the nature of their pre-organisms. They have been successfully used to reduce the growth of pathogens in the gut and stimulate the growth of beneficial flora. Some of the sugar present on the outer surface of the intestinal epithelial cells adsorbs the lectin on the surface of the bacterial cells, so the bacteria can multiply. There is a specific mannose-like hemagglutinin substance on the cell surface of the pathogen. Mannan, a yeast extract, provides mannose-adsorbing bacteria's hemagglutinin, preventing them from multiplying in the gut (Figure 1). In addition, mannan can bind to the gastrointestinal epithelial-specific receptor site to prevent bacterial growth by competitive inhibition. Several studies have shown that the number of beneficial bacteria such as Salmonella, pathogenic Escherichia coli, Staphylococcus aureus and lytic tissue can be better reduced if beneficial bacteria such as Bifidobacterium and Lactobacillus are simultaneously added. . They also prevent the adsorption of bacterial toxins. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

It has also been suggested that yeast in the intestinal tract-adsorbing region can be proliferated by an increase in the length of the villi, accompanied by an enhanced antigenic response of the intestinal mucosa. These results enhance the ability of nutrients to be digested and absorbed. 5zj China Feed Industry Information Network - based on feed, serving animal husbandry

Enhance immunity 5zj China feed industry information network - based on feed, service animal husbandry

Mannan can also enhance immunity by promoting the release of interleukin-6, which in turn stimulates the secretion of specific mannans from the liver and binds to the envelope of the invading bacteria. This triggers a complex fixed system. Mannan can also enhance immunity by increasing the concentration of plasma IgG and albumin or by cell-mediated immunomodulation. Glucan in the cell wall of yeast stimulates peripheral blood lymphocytes and extravascular macrophages to produce specific glucan receptors. The defense function of the host is enhanced by macrophages and their derived products such as cytokines.

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