Breeding dual purpose cattle, an eye must be kept also on other traits than those belonging to milk and beef production. The goal for this investigation was to examine, whether the selection for beef production, expressed as daily gain and slaughter quality brought along a rise in the frequency of difficult calvings. As the two traits are most frequently measured on the different sexes, the method of correlating average results from half sib progeny groups of bull calves (beef production) and first calving heifers (calving performance) was used. 

M. Hansen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 749–754, 1974
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