Brazil holds the largest bovine commercial herd involved in beef production in the world, with more than 157 million head (Anualpec, 2000). Josakhian (2000) reported that around 80% of the Brazilian beef herd has some fraction of Zebu breeds. More than 70% of purebred animal registered by the Zebu Breeders Association (ABCZ) consist of animals from Nelore breed, as a result of the adaptability of those animals to tropical and subtropical conditions. The Brazilian beef industry is based on Zebu cows, mainly originated in Nelore breed. The breed shows a large variability in several economic relevant traits and that indicates good opportunities for genetic improvement (Eler et al., 1995). There are several genetic evaluation and breeding projects running in Brazil at present time, the vast majority evaluating growth traits, besides scrotal circumference. Few programs consider other traits, such as reproduction or type traits.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 11, , 11.4, 2002
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