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Genetic analysis of visual assessment and body weight traits and their relationships with reproductive traits in Nellore cattle

Published online by Cambridge University Press:  31 January 2017

F. M. PATERNO ,
M. E. BUZANSKAS Open the ORCID record for M. E. BUZANSKAS [Opens in a new window] ,
W. KOURY FILHO ,
R. B. LÔBO  and
S. A. QUEIROZ
F. M. PATERNO
Affiliation:
Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista (UNESP), Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal, São Paulo, 14884-900, Brazil
M. E. BUZANSKAS*
Affiliation:
Departamento de Zootecnia, Universidade Federal da Paraíba (UFPB), Centro de Ciências Agrárias – Campus II, Rodovia BR 079 – Km 12, Areia, Paraíba, 58397-000, Brazil
W. KOURY FILHO
Affiliation:
Brasil com Z – Zootecnia Tropical, Rua Juca Quito, 800 – Sala 5, Jaboticabal, São Paulo, 14870-260, Brazil
R. B. LÔBO
Affiliation:
Associação Nacional de Criadores e Pesquisadores (ANCP), Rua João Godoy, 463, Ribeirão Preto, São Paulo, 14020-230, Brazil
S. A. QUEIROZ
Affiliation:
Departamento de Zootecnia, Faculdade de Ciências Agrárias e Veterinárias (FCAV), Universidade Estadual Paulista (UNESP), Via de Acesso Prof. Paulo Donato Castellane s/n, Jaboticabal, São Paulo, 14884-900, Brazil
*
*To whom all correspondence should be addressed. Email: [email protected]
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Summary

Genetic parameters for visual assessment traits measured at 487 days of age (body structure (BS), finishing precocity (FP) and muscling (MS)), body weight at 450 days of age (W450), age at first calving (AFC), heifer pregnancy (HP) and stayability (STAY, i.e. the probability of a cow to produce at least three calves before reaching 76 months of age) were estimated in Nellore cattle, seeking to include these traits in the selection criteria for dams. The statistical models included additive genetic and residual random effects using single- and two-trait Bayesian analyses. The average heritability estimates were equal to 0·37 for BS, 0·42 for FP, 0·37 for MS and 0·48 for W450. Age at first calving had a low average heritability estimate (0·13), while HP and STAY estimates were higher (0·36 and 0·24, respectively). The genetic correlations between AFC, HP and STAY with visual assessment traits and body weight were favourable, indicating that selecting animals with higher BS, FP, MS and W450 values will result in the indirect selection of animals with lower AFC and successful scores for HP and STAY. The selection of heifers that present an early pregnancy should anticipate AFC and improve HP in the current herd. Except for AFC, the heritability and genetic correlation estimates between the studied traits justify their inclusion in the selection criteria of the Nellore breeding programme.

Type
Animal Research Papers
Information
The Journal of Agricultural Science , Volume 155 , Issue 4 , May 2017 , pp. 679 - 687
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Copyright
Copyright © Cambridge University Press 2017 

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