[en] Previously, a highly significant QTL affecting fat yield and protein yield and mapped to the bovine BTA26 chromosome has been reported to segregate in the French Holstein cattle population. To confirm and refine the location of this QTL, the original detection experiment was extended by adding 12 new families and genotyping 25 additional microsatellite markers (including 11 newly developed markers). Data were then analyzed by an approach combining both linkage and linkage disequilibrium information, making it possible to identify two linked QTL separated by 20 cM corresponding to approximately 29 Mb. The presence of a QTL affecting protein yield was confirmed but its position was found to be more telomeric than the two QTLunderlying fat yield. Each identified QTL affecting milk fat yield was physically mapped within a segment estimated to be <500 kb. Two strong functional candidate genes involved, respectively, in fatty acid metabolism and membrane permeability were found to be localized within this segment while other functional candidate genes were discarded. A haplotype comprising the favorable allele at each QTL position appears to be overrepresented in the artificial insemination bull population.
Disciplines :
Animal production & animal husbandry Genetics & genetic processes
Author, co-author :
Gautier, Mathieu
Barcelona, Rosa Roy
Fritz, Sebastien
Grohs, Cecile
Druet, Tom ; Institut Scientifique de Recherche Agronomique - INRA > Département de Génétique Animale > Station de Génétique Quantitative et Appliquée
Boichard, Didier
Eggen, Andre
Meuwissen, Theo H E
Language :
English
Title :
Fine mapping and physical characterization of two linked quantitative trait loci affecting milk fat yield in dairy cattle on BTA26.
Publication date :
2006
Journal title :
Genetics
ISSN :
0016-6731
eISSN :
1943-2631
Publisher :
Genetics Society of America, Baltimore, United States - Maryland
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