Estimation of genetic parameters for postweaning growth traits in crossbred Angus x Zebu cattle

Authors

  • Josineudson Augusto II de Vasconcelos Silva Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Medicina Veterinária e Zootecnia, Botucatu, SP
  • Amanda Marchi Maiorano Universidade Estadual Paulista “Júlio de Mesquita Filho”(UNESP), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal, SP
  • Flávio Finati Bernardo Júnior Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Medicina Veterinária e Zootecnia, Botucatu, SP
  • Giovana Vellasco Martins Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Medicina Veterinária e Zootecnia, Botucatu, SP
  • Lucas Coimbra Novaes Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Medicina Veterinária e Zootecnia, Botucatu, SP
  • Daiane Cristina Marques da Silva Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Medicina Veterinária e Zootecnia, Botucatu, SP
  • Rógerio Abdallah Curi Universidade Estadual Paulista “Júlio de Mesquita Filho” (UNESP), Faculdade de Medicina Veterinária e Zootecnia, Botucatu, SP

DOI:

https://doi.org/10.17523/bia.v72n2p170

Keywords:

growth traits, heterozygosity, breeding value

Abstract

The objective of this study was to verify the effect of individual heterozygosity on weights at 365 (W365) and 550 (W550) days of age, and to estimate the heritability of these traits and the breeding values of animals of different breed compositions involving Angus and Zebu breeds in order to evaluate the possible use of these traits as selection criteria in crossbreeding and genetic improvement programs. Records from 5,629 crossbred Angus x Zebu animals born between 1995 and 2004 were used. Univariate and bivariate analyses of the traits were performed using an animal model and Bayesian inference. The effects included in the model were contemporary group, individual heterozygosis, age of animal at recording, and random direct genetic effect of the animal and residual. The size of the chain requested, as well as the burn-in period and thinning interval, was sufficient to obtain convergence of the posterior estimates of the genetic parameters. The heritability estimates obtained in univariate and bivariate analysis were 0.38 and 0.30 for W365 and 0.32 and 0.30 for W550, respectively. The genetic correlation between traits was 0.98. Comparison of the rank of the 10 best sires based on the breeding values for W365 and W550 showed a small difference between the traits studied. The effect of heterozygosity has importance for crossings and for obtaining higher postweaning weights, indicating that the use of animals with maximum individual heterozygosity is advantageous. W365 and W550 were found to be appropriate selection criteria and should be included in breeding programs of crossbred Angus x Zebu cattle. 

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Published

2015-02-07

Issue

Section

ANIMAL BREEDING

How to Cite

Estimation of genetic parameters for postweaning growth traits in crossbred Angus x Zebu cattle. (2015). Bulletin of Animal Husbandry, 72(2), 170-177. https://doi.org/10.17523/bia.v72n2p170

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