Mapping of a Quantitative Trait Locus for Beef Marbling on Bovine Chromosome 9 in Purebred Japanese Black Cattle |
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Authors: | K Imai T Matsughige T Watanabe Y Sugimoto |
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Institution: | 1. Hiroshima Prefectural Livestock Technology Research Center , Shobara, Hiroshima, Japan;2. Shirakawa Institute of Animal Genetics, Odakura, Nishigo , Nishi-shirakawa, Fukushima, Japan |
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Abstract: | The goal of this study is to detect quantitative trait loci (QTL) for carcass traits applicable for a DNA-based breeding system in a Japanese Black cattle population. A purebred paternal half-sib family from a commercial line composed of 65 steers was initially analyzed using 188 informative microsatellites giving a 16-cM average interval covering 29 autosomes. A significant QTL for marbling was detected in the centromeric portion of bovine chromosome (BTA) 9. After additional marker genotyping across a larger sample size composed of 169 individuals, this locus was refined to a 20-cM confidence interval between microsatellites BM1227 (24 cM) and DIK2741 (50 cM) at a 1% chromosome-wise threshold. The allele substitution effect between Q and q for a beef marbling standard score (1 to 12 range) on BTA9 was 1.0 (5.7% of total phenotypic variance in QTL contribution in this family). This result provides a primary platform for a marker-assisted selection system of the beef marbling trait within the Japanese Black (Wagyu) cattle population. |
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Keywords: | Beef marbling BTA9 Cattle QTL mapping |
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