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Analysis of longitudinal data of beef cattle raised on pasture from northern Brazil using nonlinear models

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Abstract

This study was undertaken to aim of estimating the genetic parameters and trends for asymptotic weight (A) and maturity rate (k) of Nellore cattle from northern Brazil. The data set was made available by the Brazilian Association of Zebu Breeders and collected between the years of 1997 and 2007. The Von Bertalanffy, Brody, Gompertz, and logistic nonlinear models were fitted by the Gauss–Newton method to weight–age data of 45,895 animals collected quarterly of the birth to 750 days old. The curve parameters were analyzed using the procedures GLM and CORR. The estimation of (co)variance components and genetic parameters was obtained using the MTDFREML software. The estimated heritability coefficients were 0.21 ± 0.013 and 0.25 ± 0.014 for asymptotic weight and maturity rate, respectively. This indicates that selection for any trait shall results in genetic progress in the herd. The genetic correlation between A and k was negative (−0.57 ± 0.03) and indicated that animals selected for high maturity rate shall result in low asymptotic weight. The Von Bertalanffy function is adequate to establish the mean growth patterns and to predict the adult weight of Nellore cattle. This model is more accurate in predicting the birth weight of these animals and has better overall fit. The prediction of adult weight using nonlinear functions can be accurate when growth curve parameters and their (co)variance components are estimated jointly. The model used in this study can be applied to the prediction of mature weight in herds where a portion of the animals are culled before they reach the adult age.

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Authors and Affiliations

  1. Embrapa Cerrados/Capes, Goiânia, Goiás, Brazil

    Fernando B. Lopes

  2. Federal University of Goiás, Goiânia, Goiás, Brazil

    Marcelo C. da Silva & Ednira G. Marques

  3. Animal Production Department, Federal University of Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil

    Concepta M. McManus

Authors
  1. Fernando B. Lopes
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  2. Marcelo C. da Silva
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  3. Ednira G. Marques
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  4. Concepta M. McManus
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Correspondence to Fernando B. Lopes.

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Lopes, F.B., da Silva, M.C., Marques, E.G. et al. Analysis of longitudinal data of beef cattle raised on pasture from northern Brazil using nonlinear models. Trop Anim Health Prod 44, 1945–1951 (2012). https://doi.org/10.1007/s11250-012-0161-x

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