Abstract
Backfat depth and longissimus muscle area measurements were obtained ultrasonically on live swine at about 90 kg body weight. The repeatability for the various measurements was acceptable. Ultrasonic measurements were compared to measurements obtained on vertically hanging carcasses from the same animal in three experiments. Comparable carcass and ultrasonic measurements were not always the same, but the same relationship between the two was obtained in most experiments. The discrepancy probably resulted in part from the different anatomical locations measured in the live animal than in the carcass and from the different orientation of the body, i.e., horizontal for the live animal and vertical for the carcass. Ultrasonic measurements were as well correlated as comparable carcass measurements with several indicators of body composition, i.e., chemical composition variables and average backfat thicknesses.
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