Abstract
Methods presently available for the prediction of body and carcass composition in lambs were reviewed in terms of cost, speed, precision and current usage. In vivo methods reviewed included liveweight, linear measurements, ultrasound, X-ray computed tomography (CT) and nuclear magnetic resonance (NMR)/magnetic resonance imaging. Methods reviewed for predicting composition of carcasses included subjective measurements, carcass weight, specific gravity, dressing percentage, linear measurements, optical probes, video image analysis (VIA), total body electrical conductivity (TOBEC) and bioelectrical impedance. All methods were not directly comparable as few studies have used multiple methods for prediction of body or carcass composition. Limited comparisons were possible through the residual standard deviations (RSD) published for the various methods. Although subjective methods for predicting body and carcass compositions are rapid and relatively inexpensive, the sheep industry should adopt objective methods in order to more readily change lamb carcass composition to meet consumer demand.
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