Parámetros genéticos para el control del peso al nacimiento en bovinos de carne: cruzados en el trópico bajo colombiano
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Date
2009
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Introduction. The weight, in the moment of birth,
is linked to the strength and the survival of beef
and is one of the most important factors in death
rates during the cattle’s first 24 hours of life. The
genetic evaluation for this characteristic must be
included as a part of the election criteria in genetic
improvement programs. Objective. To estimate the
variance components and the genetic parameters
for the weight at the moment of birth in a population
of crossed beef in the low tropical Colombian zone.
Materials and methods. The estimations of the
variance components were obtained by the use of
the Derivative-free restricted maximum likelihood
method. The model included, as fixed effects, herd,
individual and maternal genetic group, contemporary
group (sex, time and year of birth) and the age of the cow at the birth moment as a covariate. The random
effects were the genetic direct and maternal additives,
permanent environment of the cow and residual.
Results. Direct and maternal heritabilities were 0.24 ±
0.027 and 0.01 ± 0.009, respectively. Differences were
found among genetic groups for the characteristic
analyzed. The ½A ¼S ¼C, ½A ¼R ¼C, ¾C ¼B y
¾C ¼A groups had, at the moment of birth, a weight
superior to that of the Zebu, while the groups ½B ¼A
¼C, ¾A ¼C, ½B ½C, ½R ¼A ¼C, ½R ½C and 9/16 A
7/16 C had a lower weight. Conclusions. The direct
heritability found suggests that the selection by the
use of this characteristic is feasible for this population.
The differences found among genetic groups must be
kept in mind, in order to achieve intermediate weights
in the moment of the birth.
Description
Keywords
Ganado de carne, Corporación Universitaria Lasallista, Genética, Genética de ganado vacuno, Ganado de carne - Mejoramiento de la especie, Cruzamiento, Ganado de carne - Reproducción