Resumo

RIOS, R. M et al. CHROMOSOMAL 5 REGIONS ASSOCIATED WITH GROWTH TRAITS IN THE ROMOSINUANO CREOLE CATTLE. Rev. Med. Vet. Zoot. [online]. 2010, vol.57, n.1, pp.35-47. ISSN 0120-2952.

Growth is a quantitative trait that influences the carcass quality. In the present study, bovine chromosomal 5 regions responsible for growth variations have been identified in a romosinuano creole cattle population. The traits birth weight, weaning weight, 12 months weight, 16 months weight, the rib eye area at 12 and 16 months, back fat thickness at 12 and 16 months, rump fat thickness at 12 and 16 months, preweaning and postweaning daily gain were evaluated in 72 progenies, as well as the genotypes of 3 SNPs from the MYF5, PDE1B, IGF1 genes and 4 microsatellites (BM6026, CSSM34, RM500, ETH10) distributed along the chromosome. A linear regression analysis showed the six QTL effect associated with growth traits. Five QTL were significant at p≤0.05 for the triait birth weight, weight at 16 months, rib eye area at 12 and 16 months, and preweaning daily gain interval between 45 and 105 cM and a QTL showed a level significance of p ≤ 0.01 for the postweaning daily gain. It was demostrated according to the position of the QTLs identified in the present study, that the MYF5, PDE1B and IGF1 genes might be positional candidate genes affecting the growth variation for carcass quality in romosinuano cattle.

Palavras-chave : IGF1; genes; linkage; microsatellite marker; MYF5; PDE1B; ultrasound.

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