自抗生素药物问世以来,不仅人类自身找到了对付种种有害微生物武器,大大提高了健康水平,而且也使许多在禽畜中流行的疾病大为减少,推动了禽畜业的日益兴旺。畜牧业主在饲养禽畜期间,总是在饲料中添加抗生素,以使禽畜提高对致病细菌的抵抗力,多长膘,这成了人们的习惯做 Since the advent of antibiotic drugs, not only have mankind itself found weapons to deal with harmful micro-organisms, which have greatly improved the health level, but also greatly reduced the number of diseases endemic to livestock and promoted the livestock industry’s growing prosperity. It is customary for animal husbandry owners to keep their resistance to pathogenic bacteria longer by adding antibiotics to their feed during the livestock raising period