Factors affecting preweaning growth rate were studied in four different breeds of cattle. Breed differences gave rise to significantly different preweaning growth rates. Age of cow was found to influence calf birthmass, weaning mass, mass gain from birth to weaning, ADG from birth to weaning and weaning mass of calf as percentage of cow mass at parturition. With respect to cow efficiency three year old heifers were found to be the most efficient. Calves born late in the calving period were found to have greater birthmasses than those born early in the season. Breed-age interactions were evident.

H. C Els, H. AW Venter

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 394–392, 1990
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