The genetic evaluation of some economic traits by nature is applied for the categorical data following the discrete distribution such as calving difficulty. Janss and Foulley (1993) used a Bayesian method for bivariate genetic evaluation of both continuous and discrete natures. Wang et al. (1997) implemented a fully Bayesian analysis via Gibbs sampling to infer the genetic merit and the genetic parameters in a joint analysis of calving ease and birth weight. Abdallah and McDaniel (2000) reported that the heritability estimate of days open was 0.03. In this study, the genetic parameters of heritabilities, genetic and phenotypic correlations were estimated using the bivariate threshold animal model via Gibbs sampling for both discrete and continuous natures of calving difficulty and days open.

G. J Jeon

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.24, 2002
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