摘要
The objective of this study was to estimate genetic parameters and correlations for intake, feed efficiency and weight gain in beef cattle. Phenotypic data of average daily gain (ADG), dry matter intake (DMI), feed conversion ratio (FCR) and residual feed intake (RFI) calculated from 2,058 male and female Nellore cattle were used. The genetic parameters and heritability estimates were estimated using these data and pedigree by the AIREMLF90 program. The heritability estimates (standard error) found for ADG, DMI, FCR and RFI were 0.35(0.09), 0.46(0.09), 0.19(0.06) and 0.28(0.07), respectively. We highlighted the genetic correlation between ADG and FCR (-0.40) and DMI with RFI (0.61). The heritability and genetic correlations presented here show that is possible to include feed efficiency traits in Nellore breeding programmes, and the selection of efficient animals could reduce feed consumption without performance loss.
摘要译文
这项研究的目的是估计肉牛的摄入量，饲料效率和体重增加的遗传参数和相关性。使用从2,058只雄性和雌性Nellore牛计算的平均日增重（ADG），干物质摄入（DMI），饲料转化率（FCR）和残余采食量（RFI）的表型数据。使用AIREMLF90计划的这些数据和谱系估算遗传参数和遗传力估计值。对ADG，DMI，FCR和RFI发现的遗传力估计值（标准误差）分别为0.35（0.09），0.46（0.09），0.19（0.06）和0.28（0.07）。我们强调了ADG和FCR（-0.40）与DMI与RFI（0.61）之间的遗传相关性。这里介绍的遗传力和遗传相关性表明，可以在Nellore育种计划中包括饲料效率特性，选择有效的动物可以减少饲料消耗而不会造成性能损失。
Guilherme Henrique GebimPolizel[a];LaisGrigoletto[a];Minos EsperandioCarvalho[a];PauloRossi Junior[b];José Bento StermanFerraz[a];Miguel Henrique de AlmeidaSantana[a];. Genetic correlations and heritability estimates for dry matter intake, weight gain and feed efficiency of Nellore cattle in feedlot[J]. Livestock Science, 2018,214: 209-210