牛海绵状脑病 (ＢＳＥ) ,俗称“疯牛病” ,是侵袭牛中枢神经系统并能传染给人的致死性退化性疾病。业已证明 ,ＢＳＥ流行是由于牛吃了含有污染了病原体的羊或牛肉或肉骨粉的饲料所致。沉降分析加显微镜镜检能检测出饲料中浓度低至 0 .1 %的动物性成份 ,但不能鉴定这些成份究竟 Bovine spongiform encephalopathy (BSE), commonly known as “mad cow disease,” is a lethal degenerative disease that attacks the bovine central nervous system and can infect humans. It has been demonstrated that BSE prevalence is due to the consumption of feedstuffs containing sheep or beef or meat and bone meal contaminated with pathogens. Sedimentation analysis plus microscopic examination can detect animal feed concentrations as low as 0.1% of the animal ingredients, but can not identify these ingredients