Saccharomyces cerevisiae is an eukaryotic unicellular microorganism. Currently, products derived from Saccharomyces cerevisiae mainly include active dry yeast, disrupted yeast powder (yeast hydrolysate), yeast culture, yeast cell wall, yeast trace elements, and the like. These products can effectively improve the balance of digestive tract microbiota in livestock and poultry, enhance immunity, and provide abundant nutrients to achieve multiple functions such as preventing and treating digestive tract diseases and promoting growth. Maintain animal gastrointestinal microecological balance Animals in the gastrointestinal tract parasitize a large number of microorganisms, these microorganisms can maintain normal growth and metabolism under suitable nutrient substrates, which will help maintain metabolic balance between the various strains of bacteria and provide gastrointestinal digestion and absorption of animals. A good micro-ecological environment enables the various nutrients in the diet to be fully absorbed and utilized in the gastrointestinal tract and maximize the aquaculture benefits. Active dry yeast, disrupted yeast powder and yeast culture can all serve as microecological preparations to improve the gastrointestinal tract ecology of animals. Yeasts are facultative anaerobes that grow and multiply in animals. They can consume oxygen in the gut to form an anaerobic environment and metabolize and produce organic acids such as lactic acid, which are beneficial to the growth of lactic acid bacteria and other beneficial bacteria, and inhibit the harmful effects of E. coli and Salmonella. The growth of bacteria, thereby improving the gastrointestinal tract environment and flora structure, promote the digestion, absorption and utilization of nutrients by the gastrointestinal tract. Enhance animal immune function Yeast trace elements, zymosan, functional polypeptides, nucleotides, etc. all have the effect of improving the level of animal immunity. Mannan can improve immunity by increasing immunoglobulin levels and improving macrophage activity. Nucleotides have important nutritional and physiological functions in maintaining normal immune function, intestinal development and normal liver function. Yeast selenium and yeast chromium can increase the immunoglobulin content and reduce the incidence. In recent years, studies have found that selenium has an important role in the effective operation of the animal's immune system. Organic selenium can enhance the body's cellular immune function, enhance lymphocyte transformation ability and delayed type hypersensitivity (DTH), and can enhance humoral immunity, stimulate the immune ball Protein formation. Zinc is involved in the biosynthesis of various enzymes in the body and regulates a variety of enzymatic reactions. A reasonable zinc content can ensure that the tissues and organs of animals are in the best state, strengthen the defense ability, immune system, and enhance the animal's resistance to diseases. Elimination of toxic substances and antioxidant effects in animals Active dry yeasts grow and multiply in animals, consume oxygen, form an anaerobic environment in the animal's intestine, and metabolize to lactic acid, which can inhibit the growth of aerobic bacteria such as E. coli, thus reducing the decomposition of proteins by these aerobic bacteria, thus reducing The concentration of amines and ammonia in animals. Superoxide dismutase (SOD) and glutathione are important antioxidants and free radical eliminators. Superoxide dismutase (SOD) in yeast can counteract and block the damage caused by oxygen free radicals on cells and repair damaged cells in time. Glutathione has a high content in yeast cells and can eliminate free radicals and can play a powerful protective role. Glutathione also has an integrated detoxification effect, which can be combined with toxic compounds, heavy metal ions or carcinogens in the body, and promote its excretion, and play a role in neutralizing detoxification. Glutathione prevents oxidized hemoglobin, facilitates the activity of the enzyme, and reactivates the enzyme. Improve animal performance and reproductive performance Chromium, selenium and other mineral elements are of great significance for improving the growth and reproduction performance of animals. Selenium has a specific role in the formation and development of sperm. Selenium is one of the components of sperm mitochondrial outer membrane selenoprotein, which can protect sperm cell membrane from damage. By autoradiography, it was found that selenium is incorporated into spermatozoa and concentrated in the middle of the spermatozoa, which is related to the keratin structure in the middle of the sperm; selenium deficiency can impair the physiology of the uterine smooth muscle, resulting in retention of the placenta and a decrease in the fertilization rate. Chromium can increase the ovulation of sows, thus increasing the reproductive performance of sows, and organic selenium can also improve the reproductive performance of sows and reduce the stillbirth rate. Organic selenium can effectively improve sperm motility, and its effect is better than that of inorganic selenium. Its mechanism and the enhancement of GSH-Px activity, the decrease of nitric oxide synthase (NOS) activity, the reduction of free radicals, and the lipid peroxidation of membranes are inhibited. Sperm tail structural integrity is related. After adding organic mineral elements to poultry diets, the egg production rate and hatching rate can also be improved. Enzymatic and nutritional effects Metabolism of yeast can produce a variety of enzymes, degrade anti-nutritional factors in feed, reduce the viscosity of food in the intestine, promote the digestion, absorption, and utilization of nutrients in the gastrointestinal tract and improve feed utilization. Yeast cells are rich in many nutrients needed for growth of livestock and poultry, with a protein content of 45% to 60%, which is comparable to that of soy protein. The composition of amino acids is reasonable. The content of 8 kinds of essential amino acids in animals is high and rich in B vitamins. Such as niacin, choline, riboflavin, pantothenic acid, folic acid, etc., animal body absorption rate of up to 60% or more, is an ideal source of VB2 supplement for the animal to provide a variety of nutrients. 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Saccharomyces cerevisiae feed additives