Association of markers on bovine chromosome 5 with birth and weaning weight in Hereford cattle raised under extensive conditions.

ROGBERG MUÑOZ, A; MELUCCI, LM; PRANDO, A; VILLEGAS-CASTAGNASSO, EE; RIPOLI, MV; PERAL-GARCÍA, P; BALDO, A; AÑÓN, MC; GIOVAMBATTISTA, G

Edimburgo

Conferencia; XXXII Conference of the International Society for Animal Genetics; 2010

Society for Animal Genetics

Genetic markers have been used to assess the association of economically important traits with cattle under intensive feeding conditions; however, there is still the need to ascertain the usefulness of these markers under extensive production systems. Bovine chromosome 5 has been widely studied because several QTL have been detected. Microsatellites neighboring the Myogenic factor 5 (Myf5) gene, BP1; and Insulin-like Growth Factor 1 (IGF1) gene, ETH10, IGF1 and RM029, were selected to establish their association with BLUPs (Best Linear Unbiased Predictors) for direct Birth Weight (dBW), direct Weaning Weight (dWW) and maternal Weaning Weight (mWW). Two not related herds were used for this objective, one commercial and the other experimental. Significant associations (P ¡Ü 0.05) between dWW and all BTA5 loci (BP1, ETH10, IGF1, and RM029) were detected. Additional associations were observed between mWW and BP1. dBW was significant associated (P ¡Ü 0.05) with ETH10 genotypes and with the interaction IGF1*Herd. In particular region near BP1 marker could be contributing to the rare positive correlation between dWW and mWW previously found in the INTA Balcarce Station experimental herd. We confirmed marker association with growth traits in two BTA5 regions close to previously reported QTL obtained in intensive feeding conditions; these regions are affecting dBW, dWW and mWW also in a pasture based system.