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The purpose of this study was to find any association of the bovine growth hormone (bGH) gene with growth and carcass quality traits in Korean native cattle, Hanwoo. Genomic DNA was extracted from 21 Hanwoo individuals, and the 47 to 2,528 bp region of the bGH 2,856 bp (GenBank accession number M57764) including the promoter and the five exons was sequenced. A total of ten bGH SNPs were confirmed, including four (253 C&gt;T, 303 C&gt;T, 502 C&gt;T, and 559 G&gt;A) in the promoter, one (679 C&gt;T) in exon 1, one (1,692 T&gt;C) in intron 3, and four (2141 C&gt;G, 2258 C&gt;T, 2277 C&gt;T, and 2291 A&gt;C) in exon 5. The ten bGH SNPs were genotyped for a sample of 242 Hanwoo steers and association tests were performed to find any significant SNP that was correlated with growth and carcass quality. Of the SNPs, the 303 C&gt;T SNP in the promoter region was significantly associated with 6-month-old weight, the 559 G&gt;A SNP with longissimus dorsi muscle area, the 2141 C&gt;G SNP in exon 5 with daily weight gain, and the 2258 C&gt;T SNP with daily weight gain and carcass weight (p&lt;0.05). The significant SNPs need to be verified in other Hanwoo populations before considering implementation of marker-assisted selection for genetic improvement of growth and carcass quality in Hanwoo.

Identification of Single Nucleotide Polymorphisms (SNPs) of the Bovine Growth Hormone (bGH) Gene Associated with Growth and Carcass Traits in Hanwoo