Tyson Foods Stops Buying Cattle Fed With Zilmax by Lance Turner Posted 8/20/2013 01:30 pm Tyson Foods Inc. of Springdale has stopped buying cattle that has been fed Zilmax, a food additive given to cows to beef them up before slaughter. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access articles older than 15 days. Articles newer than 15 days are not included in this offer. Purchase Now Already have archive access? Login to view this article.