Abstract

Nowadays, the prediction of breeding values for a great number of traits is a routine task for most of cattle breeders associations and the future sires and dams can be made from designed mates. However, the right choice of the traits, which suit breeders or commercial producers expectations, has become even more difficult. Many traits, which are measurable on animals, do not directly affect profit. In addition, several economically relevant traits in a cattle production system have multiple indicator traits. The choice of the right selection criteria and the way they should be weighted seem to be the most important decisions to be taken by the breeder. The definition of a breeding objective is the first step to solve this problem. The next step is the construction of an index to identify the list of traits that influence the goal and to determine the relative importance of each of the traits in this list (Golden et al., 2000). Hazel (1943) elaborated the theory for predicting the aggregate economic merit of each animal. This methodology enables the determination of the economic value of each trait in the index. The economic value reflects the change in profit for a unity change in the trait, since all other traits in the index remain unaltered (Amer, 1994). The aim of this paper was to estimate the economic values for biological traits in the breeding objective of a Brazilian double purpose cattle breed Caracu. 

S. A Queiroz, L. C Pelicioni, J. C Sesana, B. F Silva, M. IEG Martins, A. Sanches

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 1, , 1.74, 2002
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