A federal audit of 18 beef slaughterhouses after the nation's largest beef recall has found humane handling violations in three of them. One plant was temporarily suspended.

The audit by the Department of Agriculture's Food Safety and Inspection Service found that one plant was insufficiently stunning animals, which failed to make them insensible to pain before slaughter. That plant has taken corrective actions and its suspension was lifted. None of the plants were identified.

The audit results were provided to the chairman of the Senate Appropriations agriculture subcommittee, Wisconsin Democrat Herb Kohl, for a hearing he was holding Tuesday on the USDA's response to the beef recall.