美系杜洛克种猪体尺性状遗传参数估计及其与生长性状的关系研究

Estimation of genetic parameters of body measurements traits and the relationship with growth traits in an American Duroc population

通过对杜洛克种猪体尺性状进行遗传参数估计,并评估其与生长性状之间的关系,为目标群体的遗传评估奠定基础。利用SAS软件对影响各性状的非遗传因素(场、年季和性别)进行固定效应分析,利用DMU软件和动物模型REML方法估计体长(BL)、体高(BH)和管围(CC)的加性遗传方差,计算各性状的遗传力,并估计体尺性状与达100 kg体重日龄(AGE)、100 kg体重活体背膘厚(BF)和30~100 kg料重比(FCR)的遗传和表型相关。结果表明,场、年季和性别效应对各性状影响均达显著水平;BL、BH和CC的遗传力估计值分别为0.274、0.352和0.160;窝效应值变化范围介于0.184~0.221之间;体尺性状间遗传和表型相关变化范围分别为0.552~0.674、0.100~0.568;体尺与生长性状的遗传和表型相关的变化范围分别为-0.411~0.083、-0.333~0.039,在杜洛克种猪育种中,可通过对体尺性状的间接选择来加快杜洛克种猪生长性状的遗传改良进展。

To estimate the genetic parameters for body measurements traits and estimate its correlation with growth traits of American Duroc pigs,which can provide a basic information for the genetic evaluation among these target traits.The SAS software was used to estimate effect of non-genetic factors(including farm,year,season and sex)on each trait by least square variance analysis.The REML method based on the DMU software was used to estimate the additive variance of body measurements traits(BL,body length;BH,body height;CC,cannon circumference),and then the heritabilities and genetic correlation with growth traits(AGE,age at 100 kg live weight;BF,backfat at 100 kg live weight;FCR,feed conversion ratio)were calculated.The results showed that all fixed effect had significant effect on each trait.The estimated heritabilities of BL,BH and CC were 0.274,0.352 and 0.160,respectively.The range of common litter effects was 0.184-0.221.In addition,the variation range of genetic and phenotypic correlation among body traits were 0.552-0.674 and 0.100-0.568,respectively.The variation range of genetic and phenotype between body traits and growth traits were-0.411-0.083 and-0.333-0.039,respectively.The results of this study indicated that the genetic improvement of the growth traits of Duroc pigs can be accelerated by indirect selection of body size traits in breeding.