%0 Journal Article
%T Interacci¨®n semental x ambiental en la estimaci¨®n de la correlaci¨®n gen¨¦tica entre efectos directos y maternos en bovinos para carne
%A Gallegos-Ram¨ªrez
%A Raymundo
%A Ram¨ªrez-Valverde
%A Rodolfo
%A N¨²£¿ez-Dom¨ªnguez
%A Rafael
%A Ru¨ªz-Flores
%A Agust¨ªn
%A Rodr¨ªguez-Almeida
%A F. Alonso
%J Agrociencia
%D 2011
%I Colegio de Postgraduados
%X a precise quantification of maternal influence and genetic correlation between direct and maternal effects (rd-m) is important for the genetic evaluation of weaning weight (pd) in cattle. the aim of this study was to evaluate the effect of including sire ¡Á environment interaction (environments: herd, year, herd-year or contemporary group) on the estimation of r for pd in beef cattle. five univariate animal models were evaluated in angus (a, n=2985), salers (s, n=4343) and braunvieh (se, n=12 320) breeds. fixed effects in the initial model were the linear and quadratic covariates of cow age, and the linear of purebred degree in se; the random effects were contemporary groups, direct and maternal correlated genetic effects, and permanent environment of the cow. alternative models additionally included the sire ¡Á environmentrandom effect. analyses were performed with the mtdfreml program and the models were compared through their aic values. the rd-m estimates with the model without sire ¡Á environmentinteraction were: -0.09¡À0.34, -0.71¡À0.11 and -0.44¡À0.14 for a, s and se. the inclusion of any interaction improved the prediction of models in the three breeds studied, accounting for 1 to 8 % of the phenotypic variance. the inclusion of sire ¡Á contemporary group in the model resulted in rd-m of less negative magnitude than with the model without the interaction (0.87¡À 1.21, -0.66¡À0.15 and -0.31 ¡À0.18, for a, s and se), and generally causing better relations between the predicted direct and maternal genetic values; yet in a the could not be estimated accurately. it is advisable to include sire ¡Á contemporary group interaction in the genetic evaluation model for pd of the populations salers and braunvieh.
%K model comparison
%K beef cattle
%K weaning weight
%K breeding value.
%U http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1405-31952011000600004&lng=en&nrm=iso&tlng=en