コンピュータ画像解析による和牛肉質の評価

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書誌事項

タイトル別名
  • Evaluation of Meat Quality in Japanese Beef Cattle by Computer Image Analysis
  • コンピュータ ガゾウ カイセキ ニ ヨル ワギュウ ニクシツ ノ ヒョウカ エ

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抄録

Beef carcass grade is an important factor in determining the quality and price of beef in Japan. Currently the grade is mainly estimated visually by standardized Beef Marbling Scores. The size and form of intramuscular (I/M) fat particles also influence meat quality. This study was conducted to develop a method which expresses numerically the marbling score and the form of the I/M fat via Computer Image Analysis. Progeny testing records and images of the rib-eye muscle (M. longissimus thoracic) between the 5th and 6th rib of Japanese Black (JB) and Japanese Shorthorn (JS) were used to estimate heritabilities, genetic and phenotypic correlations for growth, and carcass and meat quality traits. These data were collected from the Aomori, Akita, Iwate, and Miyagi prefectural Animal Husbandry Experimental Stations, and the Ohu National Livestock Breeding Station, for 14 years from 1975 to 1988. The mean values of the I/M fat ratios within the rib-eye muscle were 7.88% and 5.18% for JB and JS, respectively. No significant differences were detected between breeds for the area score and form score of marbling. Genetic parameters were calculated by Harvey's least squares analysis program of LSMLMW. The heritability estimates of I/M fat ratio via image analysis were 1.09 (JB), and 0.45 (JS). Genetic correlations between daily gain and marbling score by grading or I/M fat ratio via Image Analysis of JB were 0.02 and 0.01, respectively, but those of JS were 0.52 and -0.67, respectively. The phenotypic correlations between the marbling score and I/M fat ratio were comparatively high (0.63 in JB) and low (0.14 in JS). This might indicate difficulty in grading the marbling score in breeds having a low I/M fat ratio.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 63 (2), 121-128, 1992

    公益社団法人 日本畜産学会

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