Threshold models for the determination of genetic variability among reproductive traits in Nellore cattle

Authors

  • Leonardo Martin Nieto Universidade Católica Dom Bosco, Departamento de Zootecnia, Avenida Tamandaré, no 600, CEP 79117-900 Campo Grande, MS.
  • Luiz Otávio Campos da Silva Embrapa Gado de Corte, Avenida Rádio Maia, no 830, Zona Rural, CEP 79106-550 Campo Grande, MS.
  • Antônio do Nascimento Ferreira Rosa Embrapa Gado de Corte, Avenida Rádio Maia, no 830, Zona Rural, CEP 79106-550 Campo Grande, MS.

DOI:

https://doi.org/10.1590/S1678-3921.pab2020.v55.26729

Keywords:

Bayesian method, beef cattle, calving probability, stayability, threshold model

Abstract

The objective of this work was to evaluate the potential of different threshold models to determine the genetic variability in Nellore cattle, with basis on the heritability estimates for the traits stayability (STA) and first calving probability at 36 months of age (CP36). Data came from the Nellore herds participating in the animal breeding program of the Embrapa‑Geneplus partnership. Binomial and multi-threshold models were defined for the STA and CP36 traits. Heritability estimates were obtained following Bayesian procedures in the Multiple-trait Gibbs Sampler for Animal Models (MTGSAM) software, using a sire-maternal grandsire model. The heritability estimates, provided by the binary and alternative models, were, respectively, 0.08 and 0.12 for STA and 0.17 and 0.12 for CP36. The multi-threshold model can efficiently detect the genetic variability for stayability, but not for probability of calving for 36-month-old cows.

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Published

2020-08-12

How to Cite

Nieto, L. M., Silva, L. O. C. da, & Rosa, A. do N. F. (2020). Threshold models for the determination of genetic variability among reproductive traits in Nellore cattle. Pesquisa Agropecuaria Brasileira, 55(X), e01181. https://doi.org/10.1590/S1678-3921.pab2020.v55.26729

Issue

V.55, Jan./Dec., 2020 :Continuos publication

Section

ANIMAL SCIENCE