Ultrasonic Measurement of Backfat Thickness in Live Pigs by the Use of the B-mode Linear Electronic Scanner

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  • Bモードリニア電子スキャナーによる豚生体の背脂肪厚の測定
  • Bモード リニア デンシ スキャナー ニ ヨル ブタ セイタイ ノ ハイシボウ

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Abstract

The usefulness of the portable linear electronic scanner (B-mode ultrasonic machine) was evaluated for measuring the backfat thickness of live pigs. In 70 pigs, ultrasonicmeasurements of different parts of the live animals were compared with the directmeasurements of the carcass. The linear electronic scanner had the advantage of beingable to display not only vertical cross-sectional images of the body axis but alsohorizontal ones on the midline at real time. It was easy to identify the images ofdifferent tissues on the ultrasonograms. Both the skin and the connective tissue betweenthe first and second fat layers showed echogenic (white) images which produced multiplereflections. The image of the third fat layer was more echogenic and irregular than thefirst and second fat layers. Compared with the M. longissimus thoracis, the M. gluteusmedius was visualized as a sharply outlined echogenic image. The repeatability for thevarious ultrasonic measurements was acceptable but it was slightly lower for theshoulder than for the 1/2 body length and the loin. The correlation coefficients betweenultrasonic measurements obtained by two interpreters were highly significant (p<0.01) inall parts examined.The ultrasonic measurements had the tendency to be lower than thecorresponding carcass measurements. The correlation coefficients between ultrasonicand carcass measurements of backfat thickness ranged from. 84 to 88 depending on theparts. The ultrasonic measurements of backfat thickness in the different parts, exceptthe shoulder, weve closey related. These results indicate that the linear electronicscanner was a practically useful method for measuring the backfat thickness of live pigs.

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