Genetic and phenotypic parameters for sexual precocity and parasite resistance traits in Nellore cattle

被引：1

作者：

de Moraes, Mariana Mamedes ^{[1
]}

Gouveia, Gabriela Canabrava ^{[1
]}

Ribeiro, Virginia Mara Pereira ^{[1
]}

de Araujo, Andresa Eva Melo ^{[1
]}

Toral, Fabio Luiz Buranelo ^{[1
]}

Cardoso, Eduardo Penteado ^{[2
]}

机构：

[1] Univ Fed Minas Gerais, Dept Zootecnia, Escola Vet, Belo Horizonte, MG, Brazil

[2] Fazenda Mundo Novo, Uberaba, MG, Brazil

来源：

JOURNAL OF APPLIED GENETICS | 2023年 / 64卷 / 04期

关键词：

Tick; Genetic correlation; Eimeria spp; Heritability; Gastrointestinal nematodes; TROPICAL BEEF-CATTLE; REPRODUCTIVE TRAITS; TICK RESISTANCE; IMMUNE-RESPONSE; CARCASS TRAITS; GROWTH; HEREFORD; TESTOSTERONE; SELECTION; PUBERTY;

D O I：

10.1007/s13353-023-00781-9

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Indicator traits of sexual precocity are widely used as selection criteria for the genetic improvement of beef cattle; however, the impact of selection for these traits on resistance to endoparasites and ectoparasites is unknown. Therefore, this study aimed to estimate the genetic and phenotypic parameters for indicator traits of sexual precocity and parasite resistance in Nellore cattle. The sexual precocity traits evaluated were probability of first calving (PFC) and scrotal circumference at 12 and 18 months of age (SC12 and SC18). The resistance-related traits included tick (TC), gastrointestinal nematode egg (NEC), and Eimeria spp. oocyst (EOC) counts. (Co)variance components were estimated by Bayesian inference using multitrait animal models. The mean heritabilities for PFC, SC12, SC18, TC, NEC, and EOC were 0.23, 0.38, 0.42, 0.14, 0.16, and 0.06, respectively, and suggest that selection will change the mean values of these traits over time. The genetic and phenotypic correlations for most pairs formed by a precocity and a resistance trait were not different from zero, suggesting that selection for sexual precocity traits will not result in changes in resistance traits. Thus, selection for indicator traits of sexual precocity does not elicit unfavorable correlated responses in resistance to endoparasites and ectoparasites, and joint selection aimed at improving these traits can be performed using multitrait selection methods, when necessary.

引用

页码：797 / 807

页数：11

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