Mad cow is a neurodegenerative disorder in cattle that can cause holes in the brain.
Like Swiss cheese. Beef Killed In Britain, probably only the very brave still hanker for inventive dishes of brain and organ foods from cattle. Many won't any longer even eat any form of beef. That's because 56 people in Britain have thus far died of a human version of mad cow disease because they were exposed to contaminated beef organs. British beef has now been deemed by the European Commission to be as safe as any other beef.