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- W221863354 abstract "An experiment was conducted with 64 first-litter sows to evaluate the efficacy of a D2O dilution procedure for measuring in vivo body composition during the reproduction cycle. Eight gilts were each infused at breeding, 57 and 105 d postcoitum and at 5 and 25 d postpartum, with equivalent numbers of nongravid controls infused at corresponding periods except at 5 d postpartum. Results from D2O dilution were compared with body water estimates obtained from chemical analysis. An early-equilibrating D2O pool (before 15 min) was similar quantitatively to empty body (ingesta free) water in nongravid and lactating animals, but not in pregnant sows. Because of inconsistent D2O equilibration patterns in gravid sows, the early pool was considered to have equilibrated with part but not all of the water in the conceptus products. Total body D2O space measurement obtained from data following equilibration of D2O in the entire body (1 to 2 h) overestimated total body water (including gastrointestinal water) by approximately 19%. Coefficients of determination for equations relating total body D2O space to empty body and maternal body water were .96 and .88, respectively, in gestating sows and .67 and .74, respectively, for lactating sows, while coefficients of variation were below 6% in all cases. Prediction equations were developed to estimate empty and maternal body components (protein, fat and ash) from body weight and D2O space. Accuracy of protein and ash weight prediction is lowest with this procedure because it involves the composite error of estimation of the other body components." @default.
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- W221863354 date "1984-11-01" @default.
- W221863354 modified "2023-09-24" @default.
- W221863354 title "In Vivo Body Composition Estimation in Nongravid and Reproducing First-Litter Sows with Deuterium Oxide" @default.
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- W221863354 doi "https://doi.org/10.2527/jas1984.5951239x" @default.
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