FSHβ基因多态性及对不同品种猪繁殖性状的影响

Polymorphism of FSHβgene and its association with the reproductive traits in different breeds of pigs

选取FSHβ基因为影响猪繁殖性状候选基因,对8个猪种906头猪进行FSHβ基因的多态性分析,并采用最小二乘法分析了其对总产仔数、产活仔数和妊娠期的遗传效应。结果显示,FSHβ基因在嘉兴黑猪、巴马香猪、金华猪和八眉猪中几乎只有A等位基因,在美系杜洛克和嵊县花猪中以B等位基因为主,只有在大约克、长白、台系杜洛克中A,B等位基因均衡分布。遗传效应分析表明,在初产美系杜洛克猪中,BB基因型妊娠期比AB型缩短0.94 d(P<0.01);在初产大约克猪中,BB基因型妊娠期比AA型缩短1.61 d(P<0.01);在经产长白猪中,AB型产仔数和产活仔数分别比BB型多了2.27头(P<0.05)和2.31头(P<0.05)。总体而言,FSHβ基因对不同品种母猪繁殖性能效应各有差异,在初产美系杜洛克和大约克中BB基因型妊娠期更短,在经产长白猪中AB型产仔数和产活仔数更多。

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 gesta- tion 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 e- quilibrium distribution. The results of association analysis showed pigs with AA genotype had 0. 94 day shorter gesta- tion 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 repro- ductive 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.