Estimation of (co)variances for growth traits in Nellore cattle raised in the Humid Tropics of Brazil by random regression

Autores/as

  • Jorge Luís Ferreira Universidade Federal do Tocantins
  • Fernando Brito Lopes University of Wisconsin, Madison
  • Leonardo Sousa Pereira Universidade Federal do Tocantins
  • Leandro Lopes Nepomuceno Universidade Federal do Tocantins
  • José Américo Soares Garcia Faculdade de Agronomia e Veterinária Universidade de Brasilia
  • Raysildo Barbosa Lôbo Nacional de Criadores e Pesquisadores
  • Roberto Daniel Sainz University of California

DOI:

https://doi.org/10.5433/1679-0359.2015v36n3p1713

Palabras clave:

Heritability, Performance, The growth curve.

Resumen

Random regression models are currently used in genetic evaluation of beef cattle, because they allow changes in the mean and variance of the trait over time as well as estimation of (co) variances between any points along the growth curve. This study aimed to estimate (co)variances and genetic parameters for growth traits of Nelore cattle by random regression using models with heterogeneous and homogeneous residual variance. We utilized 23,278 weight records from birth to 550 days of age, from animals born between 1993 and 2010. The best-fitting model considered direct genetic, maternal genetic, permanent environmental animal and maternal permanent environmental effects, adjusted by fourth, third, sixth and fourth order polynomials, respectively. Heritability estimates for direct genetic effect increased from 120 to 450 days of age and then decreased at 550 days of age. Values at 120, 210, 365, 450 and 550 were 0.23, 0.23, 0.38, 0.52 and 0.43, respectively. Estimates of maternal heritability were low for all ages analyzed, ranging from 0.01 to 0.08. The genetic correlations were moderate to high, even at age extremes.

 

Biografía del autor/a

Jorge Luís Ferreira, Universidade Federal do Tocantins

Prof. Adjunto IV, Universidade Federal do Tocantins, Campus de Araguaína, Araguaína, UFT, TO, Brasil.

Fernando Brito Lopes, University of Wisconsin, Madison

Dr., Zooctecnista, Pós-doutorando University of Wisconsin, Madison, USA.

Leonardo Sousa Pereira, Universidade Federal do Tocantins

Médico Veterinário Autônomo, Araguaína, TO, Brasil.

Leandro Lopes Nepomuceno, Universidade Federal do Tocantins

Médico Veterinário Autônomo, Araguaína, TO, Brasil.

José Américo Soares Garcia, Faculdade de Agronomia e Veterinária Universidade de Brasilia

Prof. Associado. Faculdade de Agronomia e Veterinária, Universidade de Brasília. Brasília, DF, Brasil.

Raysildo Barbosa Lôbo, Nacional de Criadores e Pesquisadores

Diretor Presidente da Associação Nacional de Criadores e Pesquisadores, Ribeirão Preto, SP, Brasil.

 

Roberto Daniel Sainz, University of California

Prof. Associado, University of California, Davis, EUA.

Publicado

2015-06-10

Cómo citar

Ferreira, J. L., Lopes, F. B., Pereira, L. S., Nepomuceno, L. L., Garcia, J. A. S., Lôbo, R. B., & Sainz, R. D. (2015). Estimation of (co)variances for growth traits in Nellore cattle raised in the Humid Tropics of Brazil by random regression. Semina: Ciências Agrárias, 36(3), 1713–1724. https://doi.org/10.5433/1679-0359.2015v36n3p1713

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