1.It contains Mn, Zn, Cu, Fe, Mg, K, I, Se and Co et. 2.satisfy shrimp growth needing mineral elements. ... contains Mn, Zn, Cu, Fe, I, Se and Co etc. 7 mineral elements, among the Se is very abundant, promote chicken growth ... , prevent lacking Zn, Mn and Se diseases, increase feedstuff using rate. It is necessary and nutrition ...