Effects of GH gene polymorphism and sex on carcass traits and fatty acid compositions in Japanese Black cattle |
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| Authors: | Astrid ARDIYANTI Yoshie OKI Yoshihito SUDA Keiichi SUZUKI Koichi CHIKUNI Yoshiaki OBARA Kazuo KATOH |
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| Institution: | Departments of Animal Physiology and;Animal Breeding and Genetics, Graduate School of Agricultural Science, Tohoku University, Aoba, Sendai,;National Institute of Livestock and Grassland Science, Tsukuba, Ibaraki, and;School of Food, Agricultural, and Environmental Science, Miyagi University, Hatatate, Taihaku, Sendai, Japan |
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| Abstract: | To investigate the effects of bovine growth hormone (bGH) gene polymorphism on carcass traits and fatty acid compositions in Japanese Black cattle caused by nucleotide substitution of CTG (allele A)/GTG (allele B) at codon 127 and of ACG (allele A and B)/ATG (allele C) at codon 172 of bGH, GH genotypes of 135 cattle were determined using allele specific-multiplex polymerase chain reaction (PCR). Allele A gave greater rib thickness and lower melting point of fat (MP) while allele B gave higher C18:1% ( P < 0.05). Allele C gave higher C18:1, monounsaturated fatty acid (MUFA), unsaturated fatty acid (USFA) percentages ( P < 0.05). It also gave lower saturated fatty acid (SFA) percentages, higher MUFA/SFA and USFA/SFA ratios, and lower MP ( P < 0.05). Interactions of sex and GH alleles were analyzed. In heifers, allele A gave higher carcass weight, daily carcass gain, rib eye area, rib thickness, subcutaneous fat thickness, and BMS while allele B gave greater rib eye area and rib thickness ( P < 0.05). Allele C gave higher C18:1 ( P < 0.01), MUFA ( P < 0.01), USFA percentages ( P < 0.05) and MUFA/SFA and USFA/SFA ratios ( P < 0.01), and lower C16:0 and SFA percentages ( P < 0.05) and MP ( P < 0.01). GH gene polymorphism affected carcass traits and fatty acid compositions although the effects were more pronounced in heifers. |
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| Keywords: | carcass traits fatty acids GH genotype Japanese Black polymorphism |
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