By P.J. Huffstutter CHICAGO (Reuters) - U.S. drugmaker Merck & Co plans to resume sales of the controversial Zilmax animal feed additive in the United States and Canada after it completes an audit of how the product is used, a spokeswoman said on Tuesday. Merck halted sales of the muscle-building drug in August after Tyson Foods Inc. said it would stop accepting Zilmax-fed beef given some cattle were observed arriving for slaughter with signs they were having difficulty walking or moving. Merck has said it stands behind the safety of its product, but the pause added to global concerns over its use. On Tuesday, a spokeswoman for Merck's Animal Health unit said that while "it is too early to speculate on when we will resume sales for Zilmax in the U.S. and Canada," Merck was pushing forward with its quality control program to ensure the drug was being properly used.
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