A, zinc oxide and other than zinc source, the unit cost of zinc obviously low, to lower the cost of feed additives, add water amounts to 44% of the zinc sulfate, seven water 28% of zinc sulfate. B, zinc oxide for dry powder zinc source, in the animal feed of good stability, no water, not agglomeration, not degeneration, easy to feed processing and long-term storage. Feed on small effects of itamin. C, zinc oxide do zinc source, more than any other source zinc are more likely to be animals absorption, zinc supplementation effect is good.