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  • Title: Evaluation of association between polymorphism within the thyroglobulin gene and milk production traits in dairy cattle.
    Author: Khatib H, Zaitoun I, Chang YM, Maltecca C, Boettcher P.
    Journal: J Anim Breed Genet; 2007 Feb; 124(1):26-8. PubMed ID: 17302957.
    Abstract:
    In dairy cattle, many studies have reported quantitative trait loci (QTL) on the centromeric end of chromosome 14 that affect milk production traits. One of the candidate genes in this QTL region - thyroglobulin (TG) - was previously found to be significantly associated with marbling in beef cattle. Thus, based on QTL studies in dairy cattle and because of possible effects of this gene on fat metabolism, we investigated the association of TG with milk yield and composition in Holstein dairy cattle. A total of 1279 bulls from the Cooperative Dairy DNA Repository Holstein population were genotyped for a single nucleotide polymorphism in TG used previously in beef cattle studies. Analysis of 29 sire families showed no significant association between TG variants and milk production traits. Within-sire family analysis suggests that TG is neither the responsible gene nor a genetic marker in association with milk production traits.
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