Did you read the article. It says that they are 95% sure that the mad cow originated in canada, but you can't ever be 100% sure.
As far as buying defense related equipment. Tell me what canada did to help us in "Iraqi Freedom?" I can't remember. We spent countless billions on that bullshit. We warned other countries about this. Take a backseat and you'll have a backseat when it comes to having our business.
Yet another example of anti-american propaganda.