Genetic evaluations for calving ease make it possible for producers to include calving ease in their selection decisions in order to minimize the occurrence of calving difficulty in their herds. Alternative models for calving ease were investigated to determine if it was appropriate to include cow calving ease records in analyses of heifer calving ease. In both univariate (separate for each parity) and bivariate analyses, heifer calving ease was more heritable than cow calving ease. Additionally, the genetic correlation between calving ease in heifers and cows was 0.477, indicating that the traits are not the same, but are correlated. Information on cow calving ease could be included in bivariate analyses of heifer calving ease data to provide additional information in the calculation of breeding values.

J. M Rumph, M. A Faust

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.25, 2006
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