Prediction of the chemical composition of lamb carcasses from multi-frequency impedance data

The British Journal of Nutrition
R S HegartyLeigh C Ward

Abstract

Multi-frequency bioimpedance analysis (MFBIA) was used to determine the impedance, reactance and resistance of 103 lamb carcasses (17.1-34.2 kg) immediately after slaughter and evisceration. Carcasses were halved, frozen and one half subsequently homogenized and analysed for water, crude protein and fat content. Three measures of carcass length were obtained. Diagonal length between the electrodes (right side biceps femoris to left side of neck) explained a greater proportion of the variance in water mass than did estimates of spinal length and was selected for use in the index L2/Z to predict the mass of chemical components in the carcass. Use of impedance (Z) measured at the characteristic frequency (Zc) instead of 50 kHz (Z50) did not improve the power of the model to predict the mass of water, protein or fat in the carcass. While L2/Z50 explained a significant proportion of variation in the masses of body water (r(2) 0.64), protein (r(2) 0.34) and fat (r(2) 0.35), its inclusion in multi-variate indices offered small or no increases in predictive capacity when hot carcass weight (HCW) and a measure of rib fat-depth (GR) were present in the model. Optimized equations were able to account for 65-90% of the variance observed in...Continue Reading

References

Feb 1, 1992·Journal of Animal Science·J G RossS J Bartle
Mar 1, 1991·The British Journal of Nutrition·G McNeillS Gvozdanovic
Mar 1, 1995·The British Journal of Nutrition·P DeurenbergF J Schouten
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Feb 1, 1993·The Journal of Nutrition·J J Kehayias
Sep 1, 1996·The American Journal of Clinical Nutrition·K R Foster, H C Lukaski

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Citations

Mar 23, 2004·Journal of Animal Science·M AltmannE von Borell
Feb 13, 2021·Animal : an International Journal of Animal Bioscience·T L MullerR J van Barneveld

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