Special Report: Lost hooves, dead cattle before Merck halted Zilmax sales

The U.S. beef industry's dependence on the muscle-building drug Zilmax began unraveling here, on a sweltering summer day, in the dusty cattle pens outside a Tyson Foods Inc slaughterhouse in southeastern Washington state. Tyson Foods spokesman Gary Mickelson said his company doesn't know exactly what happened to the small group of cattle that were destroyed at the plant near Pasco.

via Business News - Yahoo Finance http://finance.yahoo.com/news/special-report-lost-hooves-dead-210140604.html