Date of this Version
Data obtained from 428 calves (59 Cheju native cattle, 60 Brahman, 40 Santa Gertrudis and 269 crossbreds) were analyzed to estimate main effects of environmental factors and heterosis. Mating type, sex of calf, and year of birth were significant sources of variation on most of the weights at preweaning and postweaning periods. Brahman x Cheju native cattle cross showed heterosis of 6.1% on birth weight. Maternal heterosis on weaning weight was 4.9% in Brahman back-crosses and 12.3% in Santa Gertrudis backcrosses.