UPDATE 1-Merck takes steps to return Zilmax to U.S. cattle market
November 05, 2014 at 14:06 PM EST
Nov 5 (Reuters) - Merck & Co. is taking steps to resume sales of its controversial cattle feed additive Zilmax by changing the way the drug is administered, hoping to recapture some market share in the beef industry, where the U.S. herd has the fewest animals in more than 60 years.