We previously mapped a quantitative trait locus for carcass weight, designated Carcass Weight-1 (CW-1), to bovine Chromosome 14 using a purebred Wagyu pedigree based on progeny design analysis. To refine the critical region within 8.1 cM flanked by microsatellites BMS1941 and INRA094, we constructed a bacterial artificial chromosome (BAC) contig composed of 60 tiled BAC clones and prepared a high-density physical map including 80 microsatellites, of which 55 were developed in this study. We conducted linkage disequilibrium (LD) mapping in the CW-1 region with 47 microsatellites using paternal half-sib pedigrees whose sires exhibited homozygous CW-1 Q alleles in the region. The LD mapping study significantly narrowed the CW-1 locus to the 1.1-Mb region between microsatellites DIK7012 and DIK7020. Finally, we surveyed the 1.1-Mb-region genotypes of 1700 steers from 11 bulls having −/−, Q/−, or Q/Q alleles in the region, and we examined the effect of the CW-1 Q allele on carcass weight. The presence of the first Q increased carcass weight by 23.6 kg (95% confidence interval [CI], 17.6–29.5 kg), and the second Q increased carcass weight an additional 15.2 kg (95% CI, 10.7–19.7 kg). These results indicate the presence of a gene responsible for carcass weight within the 1.1-Mb region.
Mammalian Genome – Springer Journals
Published: Jan 1, 2005
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