date:Dec 31, 2013
examination of U.S. government documents and interviews with people who had direct knowledge of the events. In the weeks before the cattle were shipped to Tyson's slaughterhouse, outside the city limits of Pasco, all had been fed Merck Co Inc's profit-enhancing animal feed additive, Zilmax.
The day after the hoofless animals were euthanized on August 6, Tyson told its feedlot customers it would stop accepting Zilmax-fed cattle. After Reuters reported the existence of a videotape of apparently