Post-weaning gain measurements were taken on 24,00 bulls tested in Ontario, Canada from 1980 to January 1990. Expected Progeny Differences (EPD's), which incorporate information on related animals, were used to give accurate genetic evaluations for bulls within breed. Ranges of EPD's for six major breeds varied by breed with Shorthorn having the smallest range (-21 kg to +13 kg) and Charolais having the largest range (-37 kg to +30 kg). Mean Across Breed Comparisons (ABC's), which also incorporate information on relatives, were highest for Charolais and lowest for Hereford. Accuracies associated with the genetic evaluations were typically between 0.38 and 0.61. Positive genetic trends over the time period were significant (P < 0.05) for Angus, Hereford, Limousin and Shorthorn.

S. L Armstrong, J. W Wilton, Larry R Schaeffer

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIII. Plenary lectures, molecular genetics and mapping, selection, prediction and estimation., , 457–460, 1990
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