温氏主要品系选育性状的遗传参数估计

遗传参数是畜禽遗传特性的重要参数，遗传参数估计是畜禽遗传评估的基础。利用温氏食品集团股份有限公司选育的专门化品系种猪近10年的各品系生长发育性状（DAY₁₀₀、DAY₃₀、ADG_30-100、BFT₁₀₀）和繁殖性状（TNB、ANB、HNB、LWB）数据，采用DMU软件，使用最大似然法和多性状线性模型，估计W51、W52、W61、W62、S11、S21、S22等7个专门化品系主要生长发育性状和繁殖性状的遗传参数。结果表明，各品系生长发育性状的遗传力为0.3~0.6，属于中、高等遗传力性状，其中，BFT₁₀₀的遗传力最高，大于0.4；DAY₁₀₀与DAY₃₀、ADG_30-100、BFT₁₀₀的遗传相关分别呈强正相关、强负相关和弱负相关。各品系的繁殖性状都为低遗传力性状，遗传力为0.1左右，其中，LWB最高，为0.12~0.18；TNB与ANB的遗传相关大于0.90，与HNB的遗传相关大于0.7，均为强正遗传相关。

Estimations of genetic parameters of main specialized lines in Wens

The genetic parameters are important genetic characteristics for livestock. The estimation of genetic parameter is a basis for livestock genetic evaluation. The data of main growth and reproduction traits of each line bred by Wens Group from 2005 to 2014 were collected. The genetic parameters were estimated using the maximum likelihood method, the multiple-trait linear model and DMU software. The results showed that the heritability for growth traits ranged from 0.3 to 0.6, belonging to medium or high heritability. Among them, the heritability of BFT₁₀₀ was the highest above 0.4. There were high positive, high negative and weak negative genetic correlations between DAY₁₀₀ and DAY₃₀, ADG_30-100 and BFT₁₀₀,respectively. The heritability of reproduction traits was low, about 0.1. The heritage of LWB was the highest from 0.12 to 0.18 among reproduction traits. The genetic correlation between TNB and ANB was above 0.90, and the genetic correlation between TNB and HNB was above 0.7.