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1 Department of Animal Science, North Carolina State University, Raleigh 27695
2 Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana 61801
3 Institute of Animal Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
4 Bovine Functional Genomics Laboratory, USDA-ARS, Beltsville, MD 20705
Corresponding author: Melissa Ashwell; e-mail: Melissa_Ashwell{at}ncsu.edu.
An extension of our previous genome scan of a North American Holstein-Friesian population was conducted to identify quantitative trait loci (QTL) affecting conformation traits. Resource families consisted of 1404 sons of 10 elite sires. Genome coverage was estimated to be 2713.5 cM (90%) for 406 markers using a granddaughter design. Regression interval mapping was used to detect QTL affecting 22 conformation traits, including body, udder, feet and legs, and dairy conformation as well as calving ease. Analysis of the families jointly identified 41 chromosome-wise significant QTL influencing conformation traits and 3 significant QTL influencing calving ease on 20 chromosomes. The false discovery rate method was used to account for multiple testing and 3/4 of the suggestive and 5/6 of significant QTL should be real effects. Fourteen of the 44 QTL were significant at the genome-wise level. Comparison of these results with other published reports identifies common QTL affecting conformation traits. Regions on 10 chromosomes appear to affect multiple traits, including conformation, milk production, and somatic cell score, within these particular US Holstein families. Additional work is needed to determine the precise locations of the QTL and select positional candidate genes influencing these traits.
Key Words: genome scan • dairy • conformation • quantitative trait loci
Abbreviation key: BD = body depth, BTA = Bos taurus chromosome, DBDR = Dairy Bull DNA Repository, FA = foot angle, FTP = front teat placement, FUA = fore udder attachment, RA = rump angle, RUH = rear udder height, TL = teat length, UD = udder depth
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