四川省外种猪ESR基因对繁殖及生长性状的影响

试验以四川省外种母猪的 3个品种 (大约克、长白、杜洛克 )为研究对象 ,采用PCR -RFLps的方法测其ESR基因的PvuⅡ多态性 ,分析了该产仔数及生长性状之间的关系。结果表明 :初产胎次中 ,ESR基因型间总产仔数 (TNB)和产活仔数 (NBA)差异极显著 (P <0 0 1 ) ,BB和AA纯合子间TNB和NBA分别相差 5 97和 3 72头 ,基因加性效应分别应为每个B基因 2 98和 1 86头。对于经产胎次 ,总产仔数在AA ,AB基因与BB基因型的差异达到极显著水平 (P <0 0 1 ) ,产活仔数在AA基因型与BB基因型间差异显著 (P <0 0 5 ) ,TNB和NBA母猪每窝BB纯合子比AA纯合子分别多 3 6 8和 2 89头 ,基因的加性效应为每个B基因分别为 1 83和 1 4 4头。头胎和经产胎次ESR基因型在初生窝重、2 0日龄头数和窝重、30或 4 5日龄头数和窝重以及 70日龄窝重之间的差异不显著 (P >0 0 5 ) ;但是以上 6个性状在ESR基因的 3种基因型间存在BB >AB >AA的趋势

Effect of the estrogen receptor gene on reproduction and production traits in Sichuan foreign breeds of swine

Effect of the estrogen receptor(ESR) gene on reproduction and production traits in three foreign porcine breeds in Sichuan province were studied by the use of PCR-RFLPs.The results showed that TNB and NBA had significant difference among sows with different genotypes in first parity( P <0 01).In latter parities,TNB had significant difference between BB and AA genotype as well as between BB and AB genotype ( P <0 01),and there was significant difference between BB and AA genotype in the NBA( P <0 05).TNB and NBA of the BB genotype were 5.97 and 3.72 more pigs/litter than those of AA genotype in first parity and 3.68 and 2.89 more pigs/litter than AA genotype in latter parities.The TNB and NBA were increased per allele B of ESR with additive effects of 3.68(1.84) and 2.89(1.44) pigs/litter in first parity (latter parities).There were no detectable effects on LWB,LS(20),LW(20),LS(30/45),LW(30/45) or LW(70) (P >0 05),but there was an inclination of the above six traits between these 3 genotypes that was BB>AB>AA in first and latter parities.(009)