Breeders usually add some medicines for animals into the feed in order to improve the abilities of disease-resistant,prevent infectious and parasitic diseases of domestic animals from occurring.

• 在家畜饲养过程中,为提高抗病能力,预防家畜传染病和寄生虫病的发生,提高饲料利用率,经常会在家畜饲料中添加各种兽药。