1.It contains Mn, Zn, Cu, Fe, Mg, K, I, Se and Co et. 2. ... -scale meat chicken nutrition demand and experiment result. It contains Mn, Zn, Cu, Fe, I, Se and Co etc. 7 mineral elements ... the Se is very abundant, promote chicken growth, prevent lacking Zn, Mn and Se diseases, increase feedstuff using rate. It is necessary ...