A roadblock for livestock drug that boosts weight

Efforts by drugmaker Merck to re-introduce its growth-promoting drug Zilmax to the market are "stuck in a kind of veterinary purgatory," says the NPR blog The Salt.

Lawsuit challenges FDA on drug used to fatten food animals

A lawsuit in federal court in San Francisco challenges FDA approval of several ractopamine-based animal drugs. The Humane Society of the United States, the Animal Legal Defense Fund and the United Farm Workers union says...