杜洛克公猪背膘厚度、日增重、日采食量和饲料效率相关性状的遗传参数估计

Estimation of Genetic Parameters of Growth and Feed Efficiency Related Traits in YX China-Line Duroc Specialized Strain

对384头扬翔华系杜洛克公猪生长育肥阶段背膘厚度(BF)、日增重(ADG)、日采食量(ADFI)、饲料转化率(FCR)和剩余采食量(RFI)5个性状用DMU程序进行遗传参数估计探究杜洛克公猪的遗传参数。结果表明,ADFI和RFI的遗传方差占表型方差的比例分别为87.73%和84.91%;BF和ADG的遗传方差占表型方差的比例分别是58.77%和58.91%;RFI与BF、ADG的表型相关系数均为零,而遗传相关系数分别为-0.22和0.15;RFI与ADFI的表型、遗传相关系数分别为0.98和0.99,RFI与FCR的表型、遗传相关系数分别为0.44和0.81。多性状模型与单性状模型的估计遗传力基本趋于一致,ADG和FCR遗传力分别是0.27和0.19,属于低遗传力性状;而BF、ADFI和RFI的估计遗传力在0.31~0.46范围,属于中等遗传力性状。

This study aimed to explore the genetic parameters of YX China-Line Duroc Specialized Strain boars.In this study,the backfat thickness(BF),average daily gain(ADG),average daily feed intake(ADFI),feed conversion ratio(FCR)and residual feed intake(RFI)of 384 growing-finishing Duroc boars from intensive pig farms were estimated by the DMU program for genetic parameter.The results showed that the genetic variance of ADFI and RFI accounted for 87.73%and 84.91%of the phenotypic variance,respectively;the genetic variance of BF and ADG accounted for 58.77%and 58.91%of the phenotypic variance,respectively.The phenotypic correlation coefficients between RFI and BF,and ADG were zero,while the genetic correlation coefficients were-0.22 and 0.15,respectively.The phenotypic and genetic correlation coefficients between RFI and ADFI were 0.98 and 0.99,respectively,and the phenotypic and genetic correlation coeffcient between RFI and FCR was 0.44 and 0.81 respeetively.The estimated heritability of the multi-trait model and the single-trait model was basically consistent.The heritability of ADG and FCR was 0.27 and 0.19,respectively,which were of low heritability traits;and the estimated heritability of BF,ADFI and RFI was in the range of 0.31~0.46,which were of moderate heritability traits.