... 3.highdigestion and absorption rate Yeast powder(Feed grade) 40%,45%,50%,55%,60%.A. Function and use1.Is a ... may be a partial substitute for fish meal ,in order to reduce costs. 2. Rich in a variety of vitamins ... in a variety of digestive enzymes, not only help to digestion ,but also improve certain enzyme activity in the digestive ... life: 12 monthsPackage 1Package 2 Yeast feed 40%,45%,50%,55%,60%