COMPONENTS OF (CO)VARIANCE FOR AGE AT FIRST AND SECOND CALVING OF NELLORE FEMALES RAISED IN SOUTHERN BRAZIL

Authors

  • Tiago Bresolin Universidade Federal de Santa Maria
  • Dionéia Magda Everling Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul
  • Camila Urbano Braz Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista Júlio de Mesquita Filho, Campus de Jaboticabal
  • Fernanda Cristina Breda Universidade Federal de Santa Maria
  • Paulo Roberto Nogara Rorato Universidade Federal de Santa Maria

DOI:

https://doi.org/10.1590/cab.v16i4.28131

Keywords:

beef cattle, fertility, Bayesian inference, genetic parameters

Abstract

The objective of this study was to estimate the heritability, genetic correlation and estimated breedingvalues for age at first (AFC) and second calving (ASC) for Nellore females raised in SouthernBrazil. The (co)variance and estimated breeding values were obtained using Bayesian inference ina bivariate analysis, adopting an animal model. The average ages were 49.30 and 69.85 months,and the heritabilities were 0.25 and 0.26, respectively for AFC and ASC. The genetic correlationbetween AFC and ASC was 0.88. The correlation between the classifications of sires according totheir estimated breeding values was 0.93. The heritability estimates for AFC and ASC suggest thepossibility of obtaining genetic gain by selection. The correlation between these traits close to oneindicates that they are virtually controlled by the same genes, and the selection for one of them willpromote correlated advanced gain for the other.

Keywords: Bayesian inference; beef cattle; genetic parameters; fertility.

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Published

2015-10-30

How to Cite

BRESOLIN, T.; EVERLING, D. M.; URBANO BRAZ, C.; BREDA, F. C.; NOGARA RORATO, P. R. COMPONENTS OF (CO)VARIANCE FOR AGE AT FIRST AND SECOND CALVING OF NELLORE FEMALES RAISED IN SOUTHERN BRAZIL. Brazilian Animal Science/ Ciência Animal Brasileira, Goiânia, v. 16, n. 4, p. 474–480, 2015. DOI: 10.1590/cab.v16i4.28131. Disponível em: https://revistas.ufg.br/vet/article/view/28131. Acesso em: 17 jul. 2024.

Issue

Vol. 16 No. 4 (2015)

Section

Animal Production

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