母猪生产力性状的遗传分析

对二花脸猪、大白猪及其杂交一代３个群体共１６８６窝的生产力性状资料进行了遗传分析。用公畜模型估计了初生窝重、初生仔猪平均重、２０日龄窝重、２０日龄仔猪平均重、４５日龄窝重、４５日龄仔猪平均重的表型参数和遗传参数。与大白猪相比，二花脸猪抚育能力较强，生长速度较慢。前４个性状受母体影响较大，后２个性状受母体影响较小。６个性状的遗传力分别为０．２５１、０．２７７、０．３４１、０．３３０、０．２３５、０．

Genetic Analysis of Sow Productivity Traits

Genetic analysis was conducted on the data of 3 populations with 1686 litters including Erhualian pigs, Large White and first cross. The phenotypic and genetic parameters among litter weight at birth (LW), average piglet weight at birth (APW), litter weight at 20 days (LW20), average piglet weight at 20 days (APW20), litter weight at 45 days (LW45), average piglet weight at 45 days (APW45) were estimated by sire model. The results indicated that Erhualian pigs had stronger maternal ability and slower growth rate compared to Large White. The first four traits (LW, APW, LW20, APW20) had larger maternal effects, while LW45 and APW45 had smaller maternal effects. The heritabilities of LW, APW, LW20, APW20, LW45, APW45 were 0.251, 0.277, 0.341, 0.330, 0.235, 0.186, respectively. The results indicated that direct selection was effective. According to our results, we considered that it was fit to select two traits (LW, LW20) out of these six traits to reflect sow productivity. Litter weight at birth could reflect the prolificacy of sow, litter weight at 20 days could reflect the maternal ability of sow.