The aims of this study were to find QTL affecting direct and maternal calving traits after first calving in the Danish Holstein population and for chromosome regions affecting more than one trait to distinguish between pleiotropic and linked QTL. Progeny-tested sons (2042) were genotyped for 384 microsatellites in up to 34 families on all 29 autosomes. A total of 27 significant QTL on 17 chromosomes were detected using an across families linear regression model. A variance component mapping approach was used to test for pleiotropy vs. linkage on seven chromosomes. QTL affecting survival and stillbirth without affecting calfsize will be an efficient way to improve genetic progress for calving traits.

J. R Thomasen, B. Guldbrandtsen, Mogens Sandø Lund, B. Thomsen, P. Sorensen

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 22.07, 2006
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