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Asian-Australasian Journal of Animal Sciences 1992;5(2): 229-235.
DOI: https://doi.org/10.5713/ajas.1992.229    Published online June 1, 1992.
Determination of longissimus muscle area in pig with ultrasonic linear electronic scanner
M. Irie
Abstract
The usefulness of a portable linear electronic scanner. B-mode ultrasonic machine, was evaluated for estimating the longissimes muscle area from ultrasonic measurement of the muscle depth in 22 live pigs. The electronic scanner was easy to operate for muscle measurements in live pigs, which did not have to be held but were caged. The cross-sectional images of longissimus muscle and covering muscles and fat appeared on the monitor with grey scale in real time. It was easy to identify the ultrasonograms of fat and muscular tissues because the images differed in the degree of the grey scale. The longissimus muscle had less echogenic image than the other muscles. The boundary lines between first, second or third layers of backfat and the longissimus muscle were distinct on the ultrasonogram. The ultrasonic measurement at the shoulder was not acceptable because of the unstable measurements and the complex tissue structure. The repeatabilities for the measurements of longissimus muscle depth at one-half body length and last rib were acceptable. The simple correlation coefficients between ultrasonic estimates of the muscle depth in live pigs and the actual areas in the carcass, were 0.50 and 0.55 at the last rib and the one-half body length, respectively. Therefore, those positions were similarly suitable to measure. The method of electronic scanner for determining longissimus muscle area from the muscle depth was suitable for practical use in the field because of the simple and inexpensive technique.
Keywords: Pigs; Ultrasonics; Longissimus Muscle; Loin Area; Linear Scanner
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