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Volume 57, issue 1
Arch. Anim. Breed., 57, 33, 2014
https://doi.org/10.7482/0003-9438-57-033
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Arch. Anim. Breed., 57, 33, 2014
https://doi.org/10.7482/0003-9438-57-033
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Nov 2014

14 Nov 2014

Genetic parameters for longevity measures in Brazilian Holstein cattle using linear and threshold models

Elisandra Lurdes Kern1, Jaime Araujo Cobuci1, Cláudio Napolis Costa2, José Braccini Neto1, Gabriel Soares Campos3, and Concepta Margaret McManus4,5 Elisandra Lurdes Kern et al.
  • 1Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brasil
  • 2Embrapa Gado de Leite, Juiz de Fora, Brasil
  • 3Departamento de Zootecnia, Universidade Federal de Pelotas (UFPEL), Pelotas, Brasil
  • 4Universidade de Brasília, Brasília, Brasil
  • 5Instituto Nacional de Ciência e Tecnologia-Informação Genético-Sanitária da Pecuária Brasileira (MCT/CNPq/FAPEMIG), Belo Horizonte, Brasil

Abstract. The aim in this study was to estimate variance components and heritability of different longevity measures related to productive life and survival at a specified age, using linear and threshold models, to specify the more appropriate measure to express longevity in Brazilian Holstein cows. Production and reproduction records of Holstein cows were collected from 1991 to 2010, for cows born between 1987 and 2006. Variance components were obtained by restricted maximum likelihood (REML) for measures of productive life and a Bayesian analysis for survival measures. The heritability estimates for longevity measures ranged from 0.06 to 0.09, using the linear model and from 0.05 to 0.18 for traits using the threshold model. This suggests an inexpressive genetic gain using selection for these traits, whereas improvements in environmental factors which affect these animals may lead to greater phenotypic gains. Survival up to 48 months from first calving was the measureing point defined as the most appropriate to be included in future official genetic evaluations of Holstein cattle in Brazil.

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