title: Quantitative trait loci affecting clinical mastitis and somatic cell count in dairy cattle.
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.
authors.affiliation: Department of Animal Science, Agricultural University of Norway, P.O. Box 5025, N-1432 As, Norway. helge.klungland@ihf.nlh.no
authors.forename: H
authors.initials: H
authors.lastname: Klungland
authors.forename: A
authors.initials: A
authors.lastname: Sabry
authors.forename: B
authors.initials: B
authors.lastname: Heringstad
authors.forename: H G
authors.initials: HG
authors.lastname: Olsen
authors.forename: L
authors.initials: L
authors.lastname: Gomez-Raya
authors.forename: D I
authors.initials: DI
authors.lastname: Våge
authors.forename: I
authors.initials: I
authors.lastname: Olsaker
authors.forename: J
authors.initials: J
authors.lastname: Ødegård
authors.forename: G
authors.initials: G
authors.lastname: Klemetsdal
authors.forename: N
authors.initials: N
authors.lastname: Schulman
authors.forename: J
authors.initials: J
authors.lastname: Vilkki
authors.forename: J
authors.initials: J
authors.lastname: Ruane
authors.forename: M
authors.initials: M
authors.lastname: Aasland
authors.forename: K
authors.initials: K
authors.lastname: Rønningen
authors.forename: S
authors.initials: S
authors.lastname: Lien
mesh_terms: D000818:Animals; D002417:Cattle; D002452:Cell Count / Q000662:veterinary; D002874:Chromosome Mapping; D003612:Dairying; D005838:Genotype; D008414:Mastitis, Bovine / Q000235:genetics*; D019655:Quantitative Trait, Heritable