Genetic parameters for growth traits in Mexican Nellore cattle.

Tropical Animal Health and Production
Juan Carlos Martínez-GonzálezEugenia Guadalupe Cienfuegos-Rivas

Abstract

The aim of this study was to estimate genetic parameters for growth traits in Mexican Nellore cattle. A univariate animal model was used to estimate (co)variance components and genetic parameters. The traits evaluated were birth weight (BW), weaning weight (WW), and yearling weight (YW). Models used included the fixed effects of contemporary groups (herd, sex, year, and season of birth) and age of dam (linear and quadratic) as a covariate. They also included the animal, dam, and residual as random effects. Phenotypic means (SD) for BW, WW, and YW were 31.4 (1.6), 175 (32), and 333 (70) kg, respectively. Direct heritability, maternal heritability, and the genetic correlation between additive direct and maternal effects were 0.59, 0.17, and -0.90 for BW; 0.29, 0.17, and -0.90 for WW; and 0.24, 0.15, and -0.86 for YW, respectively. The results showed moderate direct and maternal heritabilities for the studied traits. The genetic correlations between direct and maternal effects were negative and high for all the traits indicating important tradeoffs between direct and maternal effects. There are significant possibilities for genetic progress for the growth traits studied if they are included in a breeding program considering these ...Continue Reading

References

Jan 11, 1992·Journal of Animal Science·Z B JohnsonA H Brown
May 2, 2003·Journal of Animal Science·P R C NobreP S Lopes
Feb 21, 2009·Tropical Animal Health and Production·Aída Lorena Murillo MedinaHéctor Castillo-Juárez

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Citations

Mar 4, 2014·Tropical Animal Health and Production·Raciel J Estrada-LeónJosé C Segura-Correa
Jul 20, 2014·Tropical Animal Health and Production·Giovana VargasDanísio Prado Munari

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