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Manuscript received 23 September 1997. Initial reviews completed 5 January 1998. Revision accepted 27 April 1998.
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Departments of * Anesthesiology and Intensive Care, Nutrition and ** Orthopedics, Uppsala University, University Hospital, S-751 85 Uppsala, Sweden and Departments of Meat Sciences and Clinical Radiology, Swedish University of Agricultural Sciences, Ultuna S-750 07, Uppsala, Sweden
To evaluate the use of dual-energy X-ray absorptiometry (DXA) and underwater weighing (UWW) for body-composition measurements, the carcasses of eight piglets (12-wk old, 15-22 kg in weight) were dissected into muscle, fat and bone. Thereafter, the components were homogenized and chemically analyzed for fat and bone mineral mass. Body components as measured by DXA correlated closely to the carcass analysis (r = 0.90-1.0). However, DXA still overestimated significantly the bone mineral mass, lean mass and total weight, and underestimated fat mass. The reproducibility of measurements, expressed as the CV for fat mass was 13.5%, whereas for total weight, lean mass and bone mineral mass, the CV was 0.74-1.9%. Fat mass was overestimated by UWW using the equations of Siri or Kraybill (r = 0.77), but not by the equation of Lohman et al. (r = 0.69). The difference between the estimation of fat by chemical analysis and estimations by DXA and UWW was significantly affected by the amount of water in lean mass and fat-free mass.
Key words: body composition, pigs, underwater weighing, dual energy X-ray absorptiometry, dissection.
The Journal of Nutrition Vol. 128 No. 9 September 1998,
pp. 1543-1549
Copyright ©1998 by the American Society for Nutritional Sciences
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