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Principal component analysis of breeding values for growth, reproductive and visual score traits of Nellore cattle
Livestock Science ( IF 1.8 ) Pub Date : 2020-09-16 , DOI: 10.1016/j.livsci.2020.104262
Alexandra Fabielle Pereira Viana , Paulo Roberto Nogara Rorato , Fernanda Cristina Breda Mello , Diego Soares Machado , Andriele Medianeira Figueiredo , André Padilha Bravo , Giovani Luis Feltes

The objective of this study was to estimate genetic parameters for 7 traits of Nellore, to verify how the estimate breeding values (EBVs) of the traits are distributed in different Brazilian states, and to suggest a selection index by state/sex.Heritability (h2) and EBVs were estimated by single-trait analysis under animal model, using the AIREML method. In addition, relationships among animal EBVs for these traits were explored using principal component analysis (PCA). Direct h2 estimates ranging from 0.20 ± 0.06 to 0.51 ± 0.05 indicate that productive and morphological traits are all heritable to varying degrees. However, AFC presented low h2 estimate (0.05 ± 0.06). The first 2 principal componentspresented correlation above ± 0.60 with EBVs of all evaluated traits, retaining above 96% of the total breeding value variance.In state of Paraná they are the best EBVs for growth traits (W550 and D400) in males and females. In general, Minas Gerais was highlighted for reproductive traits in males (EBVSC550), and females (EBVAFC). Selecting for the PC1 would identify animals with favorable breeding values for all studied traits.The PCA is a good alternative in the elaboration of selection indices in Nellore breeddefined for different sex and environments.



中文翻译:

内洛尔牛生长,生殖和视觉得分性状育种值的主成分分析

这项研究的目的是估计Nellore的7个性状的遗传参数,验证该性状的估计繁殖值(EBV)如何在巴西不同州分布,并根据州/性别提出选择指数。2)和EBV是在动物模型下使用AIREML方法通过单性状分析估计的。此外,使用主成分分析(PCA)探索了这些特性在动物EBV之间的关系。h 2的直接估计值范围从0.20±0.06到0.51±0.05,表明生产性状和形态性状都可以不同程度地遗传。但是,AFC的h 2估计(0.05±0.06)。前两个主要成分与所有评估性状的EBV呈高于±0.60的相关性,保留了总育种值方差的96%以上。在巴拉那州,它们是男性和女性生长性状(W550和D400)的最佳EBV​​。总的来说,米纳斯吉拉斯州(Minas Gerais)的繁殖特征是男性(EBV SC550)和女性(EBV AFC)。选择PC1可以鉴定出对所有研究性状都具有良好育种价值的动物。PCA是制定针对不同性别和环境定义的内洛尔品种选择指数的良好选择。

更新日期:2020-09-20
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