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In the context of future growth and performance testing, this study comparescorresponding body composition results measured by two dual energy X-rayabsorptiometry systems. To test the capability of each device to detect differencesamong experimental groups widely varying in body composition, 77 pigs from 6purebred/crossbred groups were used for the experiment. Each pig was scannedconsecutively on a Norland XR-26 and on a GE Lunar DPX-IQ. Coefficients ofdetermination were: R²=0.92 for bone mineral content (BMC), R²=0.90 for bone mineraldensity (BMD), R²=0.94 for lean mass (LEAN), R²=0.92 for fat mass (FAT), R²=0.88 for leanpercentage (%LEAN) and fat percentage (%FAT). However, Norland yielded larger valuesfor %FAT and smaller values for %LEAN, BMC, and BMD than Lunar (P<0.001) with theextent of deviation depending on the specific trait and on the breeding group. Thedeviation in BMC was greater than the deviation in BMD, suggesting different bonedetecting algorithms. Both systems revealed similar differences among the breedinggroups, and ranked them in the same order based on numerical values. Differences incalibration, bone detection, and software algorithms, however, require a prior crosscalibrationto make the body composition data from both systems directly comparable.Finally, they can be used across research centres for the determination of relative andabsolute body composition differences among animal groups and individuals

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Comparison of a GE Lunar DPX-IQ and a Norland XR-26 dual energy X-ray absorptiometry scanner for body composition measurements in pigs – &amp;lt;i&amp;gt;in vivo&amp;lt;/i&amp;gt;