In order to research the effects of Chinese herb feed additives on the sperm quality and repro- ductive hormone of boars, 27 Large White boars with similar quality of semen were fed different dose of Chinese herb feed additives and their semen index and level of reproductive hormone in serum were evalu- ated. The experiment results showed that compared with control group, the length of semen, collection time, fresh semen volume, sperm density, and the content of FSH, LH and T in the serum of pigs in the 2% low dose group were improved significa...