In infected cattle, BSE concentrates in certain tissues known as specified risk material (SRM). As a public health protection, these tissues are removed from all cattle slaughtered for human consumption. To limit BSE spread among cattle, the Government of Canada banned most proteins, including SRM, from cattle feed in 1997. To provide further animal health protection, as of July 12, 2007, SRM are also banned from all animal feeds, pet foods and fertilizers.
A permit is required for transporting, accepting and disposing of certain cattle tissues capable of transmitting bovine spongiform encephalopathy (BSE), known as specified risk material (SRM).