Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Apr 24, 2012
On April 24, 2012, the United States Department of Agriculture announced the nation's fourth case of bovine spongiform encephalopathy (BSE), sometimes called mad cow disease, in a dairy cow from central California. USDA Chief Veterinary Officer Dr. John Clifford answers a series of questions about this BSE case.