カラースキャニングスコープによる肉用牛生体の胸最長筋の横断面積および脂肪含量の推定について

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タイトル別名
  • Improved Method for Estimating M. Longissimus Thoracis Fat and Area on Live Beef Cattle with a Color Scanning Scope
  • カラー スキャニング スコープ ニ ヨル ニクヨウギュウ セイタイ ノ キョウ

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抄録

A USL-21 color scanning scope was used for estimating the fat percentage and area of M. longissimus thoracis in live cattle prior to slaughter. Fourteen fattened Japanese Black and eight Holstein steers and eleven fattened Holstein cows, were scanned between their 13th rib and first lumbar region about one week prior to slaughter. The picture signals obtained were fed into a computer for rapid calculation of the area and fat percentage of the M. longissimus thoracis. For estimating fat percentage, the operational conditions were fixed (gain 3, level 2, start 0, sensitivity 2). After slaughter, the cross-sectional area and the fat content of the M. longissimus thoracis were measured at the corresponding carcass region using a planimeter and the ether extraction method. The color-scanning estimates of the M. longissimus thoracis cross-sectional area agreed considerably with the carcass measurements in each animal (r=0.95). The correlation coefficients between the color-scanning estimates based on the blue dot percentage and fat percentage of the M. longissimus thoracis were high in fattened Japanese Black steers (r=0.76), but no high correlation was obtained for Holstein steers and cows. These results indicate that the color scanning scope is possible for estimating the meat quantity of live beef cattle and the quality of Japanese Black steers. However, more study is necessary to obtain accuracy in estimating meat quality.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 59 (11), 916-921, 1988

    公益社団法人 日本畜産学会

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