Abstract
Six ultrasonic fat and muscle depth measurements, taken on the left and the right side of the fourth lumbar vertebra and third sternebra of the breast bone, were related to carcass composition to determine the accuracy of these measurements for predicting carcass compositon of live Araǵon lambs (Ternasco). Live weight alone accounted for 21, 19, 26, 18 and 47% of total variation of muscle, bone plus remainder, total fat, and subcutaneous and intermuscular fat, respectively. Addition of ultrasonic fat depth measurement on the right side of the lumbar region accounted for a further 18, 31, 33 and 36% of muscle, bone plus remainder, total carcass fat and subcutaneous fat, respectively. Addition of the same measurement taken on the left side accounted for a further 15% of intermuscular fat. Live weight alone accounted for only 4% of the total variation of kidney and pelvic fat, but the addition of ultrasonic fat depth measurement on breast bone accounted for a further 26% of the variation of this fat depot. The accuracy of prediction of carcass composition on live animals could be improved by the addition of ultrasonic fat measurements.
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