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

Tropical Animal Health and Production
Fernando B LopesConcepta M McManus

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 ...Continue Reading

References

Jul 24, 2007·Journal of Animal Science·S ForniL G Albuquerque
Aug 19, 2008·Journal of Animal Science·S ForniL G Albuquerque
Jul 1, 2008·Animal : an International Journal of Animal Bioscience·A B GbangbocheP L Leroy

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Citations

Jun 4, 2015·Pakistan Journal of Biological Sciences : PJBS·A W M HafizH Yaakub
Dec 8, 2016·Animal Science Journal = Nihon Chikusan Gakkaihō·Maria SelvaggiVincenzo Tufarelli
Oct 29, 2015·Pakistan Journal of Biological Sciences : PJBS·R M HifzanH Yaakub

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