THE BRT-M-1 OR 'MAD COW DISEASE[Bovine spongiform encephalopathy]

In modern industrial cattle-farming,  The use of meat and bone meal, produced from the ground and cooked left-overs of the slaughtering process as well as from the cadavers of sick and injured animals such as cattle, sheep, or chickens, as a protein supplement in cattle feed was widespread in Europe prior to about 1987

the use of animal byproduct feeds was  common,  in Europe. U.S. regulations only partially prohibit the use of animal byproducts