So, let me get this straight: There was a problem involving Bovine (meaning "cows"/"beef") Spongiform Encephalitis, so the government of the United States banned ... sheep?
I forgot ... "I'm from the government, I'm here to help."
IIRC, BSE's origin was from feeding sheep offal to cows. Either way, the same disease is present in both critters, just the cow version got a fancy name.
Chris