Meta-analysis of genetic-parameter estimates for reproduction, growth and carcass traits in Nellore cattle by using a random-effects model
Hinayah Rojas de Oliveira A , Henrique Torres Ventura B D , Edson Vinícius Costa B , Mariana Alencar Pereira B , Renata Veroneze A C , Marcio de Souza Duarte A , Otávio Henrique Gomes Barbosa Dias de Siqueira A and Fabyano Fonseca e Silva A
+ Author Affiliations
- Author Affiliations
A Department of Animal Science, Universidade Federal de Viçosa, 36570-000, Viçosa, MG, Brazil.
B ABCZ, Associação Brasileira dos Criadores de Zebu, Pq. Fernando Costa, 38022-330, Uberaba, MG, Brazil.
C EPAMIG, Empresa de Pesquisa Agropecuária de Minas Gerais, Rua Afonso Rato, 38001-970, Uberaba, MG, Brazil.
D Corresponding author. Email: henrique@abcz.org.br
Animal Production Science 58(9) 1575-1583 https://doi.org/10.1071/AN16712
Submitted: 2 November 2016 Accepted: 16 March 2017 Published: 24 May 2017
Abstract
Meta-analysis based on a random-effects model is used to summarise and overcome the variability between divergent parameter estimates. We proposed a meta-analysis of published heritability and genetic-correlation estimates for reproduction, growth and carcass traits in purebred Nellore cattle. In total, 197 heritability and 107 genetic-correlation estimates from 62 scientific publications were used here. Most of traits (gestation length; weights at birth, 120, 210, 365 and 550 days of age; mature weight and all carcass traits) presented direct heritability estimates ranging from 0.20 to 0.40. Age at first calving presented the lowest value among direct heritabilities (0.1498); whereas the higher values (>0.40) were found for scrotal circumference at different ages and for weight at 450 days of age. Low maternal heritability estimates (ranging from 0.06 to 0.11) were observed for all growth traits. With the exception of correlation estimates involving the age at first calving, all other correlations were positive. High correlations (>0.85) were found mainly for the same trait at different ages. The results reported here will give support to genetic evaluations when reliable estimates for different traits in purebred Nellore cattle are not available.
Additional keywords: genetic correlation, heritability, relative standard error, size effects.
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