Abstract: The polymorphism of follicular\|stimulating hormone beta subunit （FSHβ） gene， which was considered to be a major candidate gene for reproductive traits， was detected in 906 pigs from 8 different breeds， and the effects of different genotypes on reproductive traits， including total number born （TNB）， number born alive （NBA） and gestation length， were analyzed by the least square analysis. The results showed that there was almost only A allele in Jiaxing black pig， Bama miniature pig，Jinhua pig and Bamei pig， and B was the major allele in American Duroc and Shengxian pig， while only in Yorkshire， Landrance and Taiwan Duroc the A and B allele frequencies were in an equilibrium distribution. The results of association analysis showed pigs with AA genotype had 0.94 day shorter gestation length than AB genotype （P<0.01） in primiparity sow of American Duroc pigs. The total number born and number born alive of pigs with AB genotype was 2.27 and 2.31 more than BB genotype respectively（P<0.05） in pluriparity sow of Landrace pigs. In general， there were various effects of different genotypes of FSHβ gene on reproductive traits of different breeds or lines of sows， with the shorter gestation length with BB genotype in primiparity sow of American Duroc and Yorkshire pigs， and the more total number born and number born alive with AB genotype in pluriparity sow of Landrace pigs.

Key words: FSHβ gene, pig, reproductive traits