... protien45%,50%,55%,60% 3.improve animal grow Animal feed supplements:Yeast powder(Feed grade) 40%,45%,50%,55%,60%. ... amino acid balance, may be a partial substitute for fish meal ,in order to reduce costs. 2. ... Rich in a variety of vitamins and carotenoids, especially rich in vitamins B, ... B deficiency occurred. 3. Rich in a variety of digestive enzymes, not only help to digestion , ...