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 stories older than 15 days. Purchase Now Already have archive access? Login to view this article.