Dash Spandan Shashwat, Bangar Yogesh C, Magotra Ankit, Patil C S, Sharma Rohit, Chauhan Ashish, Dahiya S P
Department of Animal Genetics and Breeding, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana, India.
J Anim Breed Genet. 2025 Mar;142(2):145-154. doi: 10.1111/jbg.12892. Epub 2024 Aug 23.
The objective of the study was to estimate genetic parameters of the growth traits under Bayesian inference in Harnali sheep. The information of pedigree and targeted traits of 2404 Harnali animals born to 159 sires and 695 dams was collected for the period from 1998 to 2021. The growth traits included weight at birth (BWT), 3 (WWT), 6 (6WT) and 12 (YWT) months of age. The genetic evaluation was carried out using six univariate animal models comprising direct and maternal effects using THRGIBBS1F90 and POSTGIBBSF90 programs. The fixed factors adjusted in the analysis were period of birth, sex of lamb and dam's weight at lambing. Bayesian estimates of direct heritability under best model for BWT, WWT, 6WT and YWT traits were 0.16 ± 0.04, 0.10 ± 0.04, 0.18 ± 0.04, and 0.05 ± 0.03, respectively. The significant maternal influences observed for BWT and WWT traits with 9% and 8% contribution to total phenotypic variances, respectively. Additionally, maternal permanent environmental influences were observed to BWT (4%) and YWT trait (3%). The genetic and phenotypic correlations among studied traits were high and positive. The genetic changes were positive and significant for WWT only. It was concluded that the weight at 6 months of age can be continued as selection criterion for further genetic improvement through selection. Also, maternal effects should be considered in breeding programme for enhancing early growth performance in Harnali sheep.
本研究的目的是在贝叶斯推理下估计哈纳利绵羊生长性状的遗传参数。收集了1998年至2021年期间159头公羊和695头母羊所生的2404只哈纳利羊的系谱信息和目标性状信息。生长性状包括出生体重（BWT）、3月龄体重（WWT）、6月龄体重（6WT）和12月龄体重（YWT）。使用六个单变量动物模型进行遗传评估，这些模型包括直接效应和母体效应，采用THRGIBBS1F90和POSTGIBBSF90程序。分析中调整的固定因素有出生时期、羔羊性别和母羊产羔时的体重。在最佳模型下，BWT、WWT、6WT和YWT性状的直接遗传力的贝叶斯估计值分别为0.16±0.04、0.10±0.04、0.18±0.04和0.05±0.03。观察到BWT和WWT性状存在显著的母体影响，分别对总表型方差贡献9%和8%。此外，观察到BWT性状有4%的母体永久环境影响，YWT性状有3%的母体永久环境影响。所研究性状之间的遗传和表型相关性高且为正。仅WWT的遗传变化为正且显著。得出的结论是，6月龄体重可继续作为通过选择进行进一步遗传改良的选择标准。此外，在育种计划中应考虑母体效应，以提高哈纳利羊的早期生长性能。
