美国在1997年实施禁止给牛和其他反刍动物饲喂牛副产品的措施之后，禽肉的消费在整个肉产品的消费中增加了5%。

The United States imposed a ban on feeding beef byproducts to cattle and other cud-chewing animals in 1997, Meat byproducts constitute up to 5 percent of the poultry diet in the United States.

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事实上没有一个克雅氏病案例与食用养殖鱼类有关，但并不能保证牛的副产品饲养鱼是安全的。

The fact that no cases of Creutzfeldt Jakob disease have been linked to eating farmed fish does not assure that feeding rendered cow parts to fish is safe.

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