A major goal of livestock genome research is to understand the basis of the genetic contribution to variations in production traits. In cattle, most of economically important traits are quantitative trait loci (QTL). We have constructed many paternal half-sib families from purebred Japanese Black cattle population, whose sires are genetically related. More than 60 QTL have been mapped at the chromosome-wise of 1% significance level. Of QTL mapped, several have been repeatedly located in similar chromosome regions, for examples; carcass weight on BTA 14, and marbling on BTA 4 and 21. We performed fine mapping based on high-density physical map comprising microsatellites and SNP using a strategy of linkage disequilibrium (LD) mapping and identity by descent analysis. The LD mapping was successful for carcass weight trait on BTA

T. Watanabe, Y. Sugimoto

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 22.06, 2006
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