ORIGINAL PAPER
Genomic mapping of non-coagulation of milk in the
Finnish Ayrshire
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Department of Animal Science, University of Helsinki,
P.O. Box 28, FIN-00014 Helsinki, Finland
Publication date: 2007-01-26
J. Anim. Feed Sci. 2007;16(Suppl. 1):195-199
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ABSTRACT
The objective of this study was to identify chromosomes affecting non-coagulation of milk in
the Finnish Ayrshire. All autosomes were analysed using two pools of DNA samples. Samples from
cows milking non-coagulating (NC) and well-coagulating (E) milk were pooled. Pools included 33
NC- and 49 E-animals and they were genotyped using 184 microsatellite markers. Two candidate
chromosomes, 24 and 28, were selected based on differences between pools. Chromosomes 24 and
28 were studied using 14 microsatellite markers, individual genotyping and daughter design. Non-parametric interval mapping involved eighteen sire families with a total of 480 daughters. In interval
mapping, chromosome 24 associated to NC-milk in one family