猪雌激素受体（ESR）基因对产仔数性状的影响

猪产仔数是重要的经济性状，产仔数的提高将会大大地增加商品肉猪的产量，给现代养猪生产带来巨大的经济效益。ＥＳＲ基因是影响猪产仔数的主效基因，而且与猪的生长发育性状及酮体性状之间不存在负的基因多效性影响。采用ＰＣＲ－ＲＦＬＰｓ的方法，通过对５个不同品种的、特别是我国地方品种的２６２头母猪进行了基因多态性分析，研究表明ＥＳＲ基因在这种种群对产仔数均有极显著影响，ＥＳＲ位点ＢＢ基因型母猪平均比ＡＡ基因型母

The Genetic Effect of Estrogen Receptor(ESR) on Litter Size Traits in Pig

Litter size is one of the most important economic traits in pig production, and the more piglet numbers per litter is capable to increase pork production and bring more economic profit for Pig industry. ESR (estrogen receptor) gene has been determined to be one of the major genes affecting phenotype of litter size without any genetic negative correlation to growth and carcass traits. An optimized standard PCR-RFLP protocol is employed to type 262 sows from 5 different breeds in ESR loci, and then with the computation based on linear model ESR gene is confirmed to be a major locus significantly associated with litter size (P < 0.001). The genetic effect of ESR gene is quite large in these breeds, especially in these Chinese pig population. The sows of beneficial homozygote BB produce l.40-3.37 total number born / litter and 0.63- 3.58 number born alive / litter more than the sows of non- beneficial homozygote An do. The information found in the present stUdy is very important and could be utilized as DNA marker for improvement of reproduction trait in practice of pig breeding