Animal improvement has been achieved by selection based either on phenotype or on predicted additive genetic merit of the animals for production traits. Molecular biology techniques allow the identification of genetic variation at specific loci and the association between variation at quantitative trait loci (QTL) and production traits. The final goal is to use marker assisted selection to improve the genetic gain achieved by selection as a result of higher accuracy. Candidate gene strategy has been proposed to direct the search for QTLs, assuming that the genetic variation at genes affecting the physiological pathways related to a phenotype would be more likely to affect the quantitative variation at that phenotype. Polymorphisms at growth hormone gene have been associated with several production traits in bovine such as milk production and quality (Lagziel et al., 1996), growth (Rocha et al., 1992) and carcass composition and quality (Taylor et al., 1998). Genes coding for milk proteins have been associated with milk quality and yield (Ron et al., 1994) and also with growth traits (Lin et al., 1987 ; Moody et al., 1996). The objective of the present work was to investigate the effects of growth hormone (GH), κ-casein (CSN3) and β-lactoglobulin (LGB) polymorphism in growth traits of three beef cattle crosses (Aberdeen Angus X Nellore, Canchim X Nellore and Simmental X Nellore).
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 11, , 11.41, 2002
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