Merck Animal Health has issued a statement about its Zilmax feed additive, which was pulled from the marketplace several months ago.

Announcement comes after Tyson Foods' notice that it would stop purchasing cattle fed with the feed additive.

National Beef Packing Co. and JBS USA both issued statements that they would continue to accept cattle fed with Zilmax.

Tyson Foods announced it will stop buying cattle fed with the growth additive Zilmax in order to protect the animal's welfare.