Genetic evaluation of weaning weight and udder score in Nellore cattle

被引：4

作者：

Vargas de Oliveira, Matheus Henrique ^{[1
]}

de Vasconcelos Silva, Josineudson Augusto, II ^{[2
]}

da Silva Faria, Ricardo Antonio ^{[1
]}

de Paiva, Jose Teodoro ^{[3
]}

Malheiros, Jessica Moraes ^{[4
]}

Cruz dos Santos Correia, Luiz Eduardo ^{[1
]}

Albuquerque, Lucia Galvao ^{[1
]}

Gaya, Leila de Genova ^{[5
]}

机构：

[1] Sao Paulo State Univ UNESP, Coll Agr & Vet Sci FCAV, Jaboticabal, SP, Brazil

[2] Sao Paulo State Univ UNESP, Sch Vet Med & Anim Sci FMVZ, Botucatu, SP, Brazil

[3] Fed Univ Vicosa UFV, Vicosa, MG, Brazil

[4] Embrapa Southeast Livestock EMBRAPA, Sao Carlos, SP, Brazil

[5] Fed Univ Sao Joao del Rei UFSJ, Sao Joao Del Rei, MG, Brazil

来源：

LIVESTOCK SCIENCE | 2021年 / 244卷

关键词：

Bayesian inference; Bos taurus indicus; Maternal effect; Selection; Variance components; HEIFER PREGNANCY; TRAITS; GROWTH; BIRTH; ASSOCIATION; PARAMETERS; COMPONENTS; MODELS; CALVES; COWS;

D O I：

10.1016/j.livsci.2021.104400

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

The aim of this study was to estimate genetic parameters for weaning weight (WW) and udder score (US) of 186,151 Nellore animals raised in extensive systems. The (co)variance components and estimated breeding values (EBVs) were obtained by two-trait analyses using Bayesian inference. The maternal effect (ME) was expressed as the maternal additive genetic variance of the calf's weaning weight (WW). The direct heritabilities were 0.13 +/- 0.012 and 0.23 +/- 0.012 for WW and US, respectively. The maternal heritability was 0.11 +/- 0.012 for WW. The genetic correlations between WW and US (0.48 +/- 0.053), WW and ME (0.41 +/- 0.067), and US and ME (0.31 +/- 0.041) were positive and moderate. Cows with maternal udder scores (US_M) 3 and 4 showed higher EBVs for ME (2.58 +/- 0.070 and 2.88 +/- 0.214, respectively) and their progeny had higher EBVs for WW (4.58 +/- 0.058 and 5.07 +/- 0.168) and US (0.20 +/- 0.001 and 0.26 +/- 0.005). The genetic trends demonstrate genetic progress in the selection program over the years, with values of 0.19 kg and 0.01 points for WW and US, respectively. The genetic trend in ME was 0.04 kg for WW. In addition, a positive genetic correlation was observed between these traits, as well between the traits and ME, i.e., selection would result in positive genetic gains. The use of US_M may help improve body weight and udder quality in the progeny. Furthermore, the trends indicate that the selection adopted on the farms has been effective in promoting genetic progress.

引用

页数：5

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