Feed Makers Warned on Mad Cow Rules

Hundreds of animal feed producers are violating rules intended to keep mad cow disease out of the United States, prompting the government to warn that companies must shape up or expect shutdowns, even prosecution. The food supply remains safe despite the violations because no cases of mad cow disease have been found in U.S. cattle, the Food and Drug Administration said. But the violations are serious because companies that don’t follow the FDA’s rules could spread the disease through animal feed. Many companies have received warning letters, and some feed has been recalled.