Relationships between fatty acid compositions and image analysis traits of the rib eye in Japanese Black cattle fattened in Hokkaido [Japan]
2008
Maehara, M.(Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)) | Murasawa, N. | Nakahashi, Y. | Hidaka, S. | Kato, T. | Kuchida, K.
The aims of this study were to investigate the features of fatty acid compositions of Japanese Black cattle and to examine the relationships between those compositions and dimensional characteristics of marbling in the rib eye. The fatty acid composition of the rib eye muscle of 572 Japanese Black cattle, fattened in Hokkaido, was analyzed using gas chromatography. High-definition digital images of the 6-7th rib of the carcass were taken using the mirror type photographic equipment. Image analysis traits (ex ; marbling area percentage to rib eye area, coarseness index of marbling, shape of rib eye) were calculated with computer image analysis software (BeefAnalyzer II). The relationships between image analysis traits for the rib eye area and each of the fatty acid components (C14 : 0 myristic acid, C14 : 1 myristoleic acid, C16 : 0 palmitic acid, C16 : 1 palmitoleic acid, C18 : 0 stearic acid, C18 : 1 oleic acid and C18 : 2 linoleic acid) were analyzed. The percentage of mono unsaturated fatty acids (MUFA) to the total fatty acids came to be a sum total of C14 : 1, C16 : 1 and C18 : 1 percentages. Averages of chemically measured MUFA% and marbling area ratios to rib eye area measured with computer image analysis were 57.0% (steers : 56.4%, heifers : 58.3%, P0.01) and 44.4% (steers : 45.6%, heifers : 41.6%, P0.01), respectively. The MUFA% showed a positive correlation with the slaughter age and BFS number (0.27 and 0.25 respectively : P0.01). There were no fatty acids showing significant correlations with the unit price of the carcass. Only stearic acids showed a significant correlation with BMS No (-0.11 : P0.01). Significant correlation coefficients of MUFA% with the overall coarseness of the marbling (r
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