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Fine Mapping QTL for mastitis resistance on BTA9 in three Nordic red cattle breeds

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  • G Sahana
  • M S Lund
  • L Andersson-Eklund, Swedish University of Agricultural Sciences, Sweden
  • N Hastings, Roslin Institute, United Kingdom
  • A Fernandez, Swedish University of Agricultural Sciences, Sweden
  • T Iso-Touru, MTT, Agrifood Research Finland, Finland
  • B Thomsen
  • S Viitala, MTT, Agrifood Research Finland, Finland
  • P Sørensen
  • J L Williams, Parco Tecnologico Padana, Italy
  • J Vilkki, MTT, Agrifood Research Finland, Finland
  • Department of Genetics and Biotechnology
  • Biostatistik
  • Molekylær Genetik og Systembiologi
A QTL affecting clinical mastitis and/or somatic cell score (SCS) has been reported previously on chromosome 9 from studies in 16 families from the Swedish Red and White (SRB), Finnish Ayrshire (FA) and Danish Red (DR) breeds. In order to refine the QTL location, 67 markers were genotyped over the whole chromosome in the 16 original families and 18 additional half-sib families. This enabled linkage disequilibrium information to be used in the analysis. Data were analysed by an approach that combines information from linkage and linkage disequilibrium, which allowed the QTL affecting clinical mastitis to be mapped to a small interval (BM4208 and INRA084. This QTL showed a pleiotropic effect on SCS in the DR and SRB breeds. Haplotypes associated with variations in mastitis resistance were identified. The haplotypes were predictive in the general population and can be used in marker-assisted selection. Pleiotropic effects of the mastitis QTL were studied for three milk production traits and eight udder conformation traits. This QTL was also associated with yield traits in DR but not in FA or SRB. No QTL were found for udder conformation traits on chromosome 9
Original languageEnglish
JournalAnimal Genetics
Pages (from-to)354-362
Number of pages9
Publication statusPublished - 2008

    Research areas

  • dairy cattle, mastitis, quantitative trait loci, somatic cell score

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