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 ca lf, and year of birth were significant sources of variation on most of the weights at preweaning and post weaning periods. Brahrcn 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.

D. H Baik, Kim D C

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 314–318, 1986
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