摘要
This study estimated genetic parameters and (co)variance components for dry matter intake (DMI), average daily gain (ADG), feed conversion rate (FCR), residual feed intake (RFI), residual body weight gain (RWG) and residual intake and body weight gain (RIG) in Nellore cattle. We also estimated the genetic and phenotypic correlations between these traits with growth and carcass traits. We used data on feed efficiency of 1038 Nellore males (Bos indicus), being 147 castrated and 891 young bulls. The animals were progenies of 176 sires and 779 dams, composing a relationship matrix of 3521 animals. The (co)variance components and genetic parameters were estimated by GIBBS2F90 software, using the Bayesian approach. The heritability estimates for DMI, RFI and RIG were 0.40, 0.38 and 0.54, respectively. The genetic correlations between all feed efficiency and carcass traits were low. The traits analyzed showed enough genetic variability and heritability, thus the inclusion of feed efficiency in animal breeding programs of Nellore cattle is feasible. The RIG showed higher heritability and a selection for feed efficiency does not have a negative effect on carcass traits.
摘要译文
这项研究估计遗传参数和（共）方差分量的干物质采食量（DMI），平均日增重（ADG），饲料转化率（FCR），剩余的采食量（RFI），残余体重增加（RWG）和残余量和体重增益（RIG）中内洛尔牛。我们也估计这些特征与生长和胴体性状的遗传和表型相关性。我们用在1038内洛尔男性饲料效率（瘤牛）的数据，被阉割的147和891小公牛。该动物176种牛和779大坝后代，组成了3521动物的关系矩阵。（共）方差分量和遗传参数进行了GIBBS2F90软件估计，采用贝叶斯方法。遗传估计DMI，RFI和RIG为0.40，0.38和0.54，分别。所有的饲料效率和胴体性状之间的遗传相关性较低。分析性状表现出了足够的遗传变异和遗传，因此，在内洛尔牛动物育种计划列入饲料效率是可行的。该钻机具有较高的遗传力和选择饲料效率不会对胴体性状有负面影响。
M.H.A. Santana[a]; G.A. Oliveira Junior[a]; R.C. Gomes[b]; S.L. Silva[a]; P.R. Leme[a]; T.R. Stella[a]; E.C. Mattos[a]; P. Rossi Junior[c]; F.S. Baldi[d]; J.P. Eler[a]; J.B.S. Ferraz[a]. Genetic parameter estimates for feed efficiency and dry matter intake and their association with growth and carcass traits in Nellore cattle[J]. Livestock Science, 2014,167: 80–85