The functions of dry yeast products in monogastric animals are mainly completed in the stomach, duodenum, small intestine and cecum, while ruminants are mainly completed in the rumen.

Single stomach animal: compared with rumen, single stomach animal is an animal with only one gastric gland, including chicken, pig, human, etc.

Ruminant: an animal having ruminant digestion. For example, camel, deer, giraffe, alpaca, antelope, cattle, sheep and so on, mostly eat grass. Because this kind of animal has complex ruminant stomach and can ruminate food, it is called ruminant.

At present, the main functions of feed yeast products are to promote growth and improve immunity.

1. By improving the gastrointestinal environment and flora structure, regulating gastrointestinal fermentation, reducing the production of lactate, improving the stability of pH value, promoting the reproduction and vitality of beneficial flora dominated by Lactobacillus and cellulose bacteria, increasing the effective concentration of beneficial bacteria, promoting the decomposition, synthesis, digestion, absorption and utilization of nutrients in the gastrointestinal tract, so as to increase the intake and improve the animal's response to Feed utilization rate, improve production performance.

2. Yeast can be used as living bacterial precursor, It can effectively inhibit the reproduction of pathogenic microorganisms, participate in the survival competition of pathogenic microorganisms, repel the attachment of pathogenic bacteria on the surface of gastrointestinal mucosa, assist the body to eliminate toxins and their metabolites, prevent the absorption of toxins and wastes, enhance the immunity and disease resistance of the body, and play a health role in the prevention and treatment of animal digestive system diseases; At the same time, it can stimulate the development of gastrointestinal tract. In addition, yeast products contain unknown growth factors, which can promote growth.