A note on the use of impedance measurements for the prediction of carcass composition in lambs

Abstract

The absence of a simple, accurate method of lamb carcass composition assessment presents difficulties in satisfying an increasing consumer demand for leaner meat. Present carcass classification methods, depending on visual appraisal by trained personnel, may be perceived as subjective and consequently little support for the scheme is found within the industry. Ten carcasses of varying weight (19·9 (s.d. 5·9) kg) and side concentration of fat (303·61 (s.d. 102·70) g/kg) were assessed for impedance to the flow of an alternating current (800μΛ at 50Hz) by use of an impedance analyser. Impedance measurements were highly repeatable (> 0·90) and prediction equations for side concentration of fat and lean produced residual s.d.s of 23·25 to 18·80 g/kg and 37·10 to 18·55 g/kg respectively. Impedance measurements may provide an inexpensive, accurate and simple means of assessing lamb carcass composition