[en] The aim of this study was to determine a genetic basis for IgA concentration in milk of Bos taurus. We used a Holstein-Friesian x Jersey F2 crossbred pedigree to undertake a genome-wide search for QTL influencing IgA concentration and yield in colostrum and milk. We identified a single genome-wide significant QTL on chromosome 16, maximising at 4.8 Mbp. The polymeric immunoglobulin receptor gene (PIGR) was within the confidence interval of the QTL. In addition, mRNA expression analysis revealed a liver PIGR expression QTL mapping to the same locus as the IgA quantitative trait locus. Sequencing and subsequent genotyping of the PIGR gene revealed three divergent haplotypes that explained the variance of both the IgA QTL and the PIGR expression QTL. Genetic selection based on these markers will facilitate the production of bovine herds producing milk with higher concentrations of IgA.
Disciplines :
Genetics & genetic processes
Author, co-author :
Berry, Sarah; ViaLactia Biosciences, Auckland, New Zealand
Coppieters, Wouter ; Université de Liège - ULiège > Département de productions animales > GIGA-R : Génomique animale
Davis, Stephen; ViaLactia Biosciences, Auckland, New Zealand
Burrett, Alayna; ViaLactia Biosciences, Auckland, New Zealand
Thomas, Natalie; ViaLactia Biosciences, Auckland, New Zealand
Palmer, David; School of Biological Sciences, University of Auckland, Auckland, New Zealand,
Kelly, Van; School of Biological Sciences, University of Auckland, Auckland, New Zealand,
Obolonkin, Vladimir; Livestock Improvement Corporation, Hamilton, New Zealand
Sanders, Kathryn; Livestock Improvement Corporation, Hamilton, New Zealand
Spelman, Richard; Livestock Improvement Corporation, Hamilton, New Zealand
Georges, Michel ; Université de Liège - ULiège > Département de productions animales > GIGA-R : Génomique animale
Lehnert, Klaus; ViaLactia Biosciences, Auckland, New Zealand
Snell, Russell; School of Biological Sciences, University of Auckland, Auckland, New Zealand,
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