Using fresh beer yeast paste as a raw material, brewer yeast powder is manufactured by concentration and drying processes for animal nutrition. It is the best source of bacterial protein for livestock, poultry and aquaculture. In addition, it is rich in 18 kinds of amino acids, , organic trace elements , vitamin B complex and minerals, and is a natural, environmentally friendly and highly effective protein feed raw material without contamination, residues, toxicity and side effects.