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Quantitative trait loci affecting clinical mastitis and somatic cell count in dairy cattle |
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| Authors: | Helge Klungland Ayman Sabry Bjørg Heringstad Hanne Gro Olsen Luis Gomez-Raya Dag Inge Våge Ingrid Olsaker Jørgen Ødegård Gunnar Klemetsdal Nina Schulman Johanna Vilkki John Ruane Monica Aasland Knut Rønningen Sigbjørn Lien |
| Affiliation: | Department of Animal Science, Agricultural University of Norway, P.O. Box 5025, N-1432 ?s, Norway, NO Department of Morphology, Genetics and Aquatic Biology, Norwegian College of Veterinary Medicine, P.O. Box 8146 Dep., N-0033 Oslo, Norway, NO Agricultural Research Centre MTT, Animal Production Research, Animal Breeding, FIN-31600 Jokioinen, Finland, FI |
| Abstract: | Norway has a field recording system for dairy cattle that includes recording of all veterinary treatments on an individual animal basis from 1978 onwards. Application of these data in a genome search for quantitative trait loci (QTL) verified genome-wise significant QTL affecting clinical mastitis on Chromosome (Chr) 6. Additional putative QTL for clinical mastitis were localized to Chrs. 3, 4, 14, and 27. The comprehensive field recording system includes information on somatic cell count as well. This trait is often used in selection against mastitis when direct information on clinical mastitis is not available. The absence of common QTL positions for the two traits in our study indicates that the use of somatic cell count data in QTL studies aimed for reducing the incidence of mastitis should be carefully evaluated. Received: 9 May 2001 / Accepted: 6 July 2001 |
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