Editing and modeling of milk production data for genetic evaluation of Murrah buffaloes

Authors

  • Andréa Carolina Santos de Souza Universidade Estadual do Sudoeste da Bahia, Praça Primavera, no 40, Primavera, CEP 45700-000 Itapetinga, BA.
  • Marcos Paulo Gonçalves de Rezende Universidade Estadual do Sudoeste da Bahia, Praça Primavera, no 40, Primavera, CEP 45700-000 Itapetinga, BA.
  • Paulo Luiz Souza Carneiro Universidade Estadual do Sudoeste da Bahia, Departamento de Ciências Biológicas, Avenida José Moreira Sobrinho, s/no, Jequiezinho, CEP 45200-000 Jequié, BA.
  • Bárbara Machado Campos Universidade Estadual do Sudoeste da Bahia, Praça Primavera, no 40, Primavera, CEP 45700-000 Itapetinga, BA.
  • Carlos Henrique Mendes Malhado Universidade Estadual do Sudoeste da Bahia, Departamento de Ciências Biológicas, Avenida José Moreira Sobrinho, s/no, Jequiezinho, CEP 45200-000 Jequié, BA.

DOI:

https://doi.org/10.1590/S1678-3921.pab2017.v52.24181

Keywords:

Bubalus bubalis, lactation period, genetic parameters, bull summary

Abstract

The objective of this work was to assess the effect of editing and modeling of milk production data for genetic evaluation of Murrah buffaloes. Six strategies for evaluating milk production were analyzed: observed milk production (OMP); adjustment of milk production data to 305 (MP305) and 270 (MP270) days of lactation; removal of the 5 (MP5%) and 10% (MP10%) shortest lactation periods; and milk production along the lactation period as linear covariate (MPCO). Genetic parameters were estimated using the Bayesian inference, with heritability estimates of 0.19 to 0.23 and repeatability estimates of 0.35 to 0.36. Sires classified by OMP were high correlated to those classified by the other models, however, correlations to MP270, MP305 and MPCO decreased when considering only the best 20% sires. OMP showed greater differences in absolute mean deviations when compared with MPCO, MP270 and MP305. The strategies of analysis had similar heritabilities and stabilities. However, changes in the ranking of sires with better classifications, due to overestimation of genetic values, as occurred in the models MP305, MP270 and MPCO, may lead to a decrease in the genetic progress of the herd.

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Published

2017-12-21

How to Cite

Souza, A. C. S. de, Rezende, M. P. G. de, Carneiro, P. L. S., Campos, B. M., & Malhado, C. H. M. (2017). Editing and modeling of milk production data for genetic evaluation of Murrah buffaloes. Pesquisa Agropecuaria Brasileira, 52(12), 1261–1267. https://doi.org/10.1590/S1678-3921.pab2017.v52.24181

Issue

v.52, n.12, dez. 2017

Section

ANIMAL SCIENCE