Records of weights at birth, weaning and yearling in Angus and Tropicarne cattle breeds were used to compare univariate (UV) vs bivariate (BV) analysis for prediction of breeding values. UV analyses were carried out to identify the model that best fit the data for each breed, using likelihood ratio tests. BV analyses considered the effects from UV analyses, adding only the covariances for direct, maternal and residual effects between the traits. For some traits, the use of BV analyses improved the estimates of heritability, the accuracy of predicted breeding values, and the prediction ability of the models. For most traits, important changes in ranking of animals were observed depending on the type of analysis used. Therefore, the identification of the most appropriate type of analysis for each trait and population is required.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 03.67, 2006
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