The effects of class II genes within the BoLA DQ region on mastitis was analysed on 196 AI bulls of the Swedish Red and White breed. The bulls were DQ typed by use of restriction fragment length polymorphisms. The level of resistance was measured as breeding values of the bulls, constructed from progeny records on veterinary treatments and somatic cell counts respectively. Our previous analysis, based on breeding values for clinical mastitis only, showed that one of the haplotypes, DQ1A, was significantly associated with lower breeding values for clinical mastitis. In the present analysis with updated breeding values, the significant effect of DQ1 A on clinical mastitis remained. However, no significant effect of DQ1A on the breeding value for SCO was found. No other DQ haplotype showed any significant effect on any of the mastitis traits analysed.

A. Lunden, S. Sigurdardottir, I. Edfors-Lilja, B. Danell, J. Rendel, Leif Andersson

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 497–500, 1990
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