Heritability estimate for stayability in nelore cows
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Data
2003-01-01
Autores
Silva, JAIIV
Eler, J. P.
Ferraz, JBS
Golden, B. L.
Oliveira, H. N.
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
The objective of the present study was to determine the possibility of using stayability (STAY) of dams as a selection criterion for fertility in the Nelore breed. STAY was defined as whether or not a cow calved in a herd at a specific age or after this age given that she had calved at an earlier age. The specific ages studied were 5 (STAY5), 6 (STAY6) and 7 (STAY7) years. Data on 53 271, 46 011 and 41517 animals were analyzed for the respective ages. The Method 91 was used to estimate the variance components and a maximum threshold a posteriori model was used to predict the genetic values. The analyses provided h(2) estimates of 0.117+/-0.003, 0.122+/-0.004 and 0.171+/-0.005 for STAY5, STAY6 and STAY7, respectively. The ease with which the trait can be recorded and the h 2 estimates indicate that the use of this trait as a selection criterion can contribute to increased dam fertility. (C) 2002 Elsevier B.V. B.V. All rights reserved.
Descrição
Palavras-chave
cattle-genetics, method R, reproductive trait, survival, threshold model
Como citar
Livestock Production Science. Amsterdam: Elsevier B.V., v. 79, n. 1, p. 97-101, 2003.