Genetic correlations were estimated between growth traits in Bonsmara heifers and bulls that were reared together until weaning, whereafter the heifers were reared extensively on natural pasture and the bulls intensively in feedlots. The genetic correlations between the sexes for preweaning traits were close to unity, whereas they were much lower and even close to zero for postweaning traits. Selection for growth traits on bulls in feedlots would probably not affect growth of heifers on pastures, indicating that feeder-breeder or sexual dimorphism may be genetically induced by different nutritional environments.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 210–213, 1994
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