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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Validation of the doubly-labeled water (DLW) method for estimating CO(2) production and water flux in growing poultry chicks
Auteurs :	J. A. Gessaman, Auteur ; K. Newgrain, Auteur ; B. Green, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (35(1) JAN 2004)
Article en page(s) :	71-96
Langues:	Anglais
Résumé :	This study is the first validation of the doubly-labeled water (DLW) method on birds (1) to evaluate the accuracy of 2 points versus multiple points for computing fractional isotopic washout rates (k) and CO(2) production (rCO(2)), (2) to measure CO(2) production and water flux each day over a 4-day period, (3) to compare measured fractional evaporative water loss (r(G)) with assumed values that provide DLW estimates of rCO(2) with zero error, and (4) to measure the effect of assumed r(G); on the error of estimating water influx and efflux. Percent error of CO(2), production of six growing poultry chicks estimated by the DLW method was not correlated with mean daily relative growth rates of up to 5%, nor with daily rates of energy retained in growth of up to 320 kJ/day/kg, nor was it significantly reduced by using multiple points (5 points) rather than 2 points to compute fractional isotopic washout rates (k) and isotope pool sizes. Its seems clear from our study and the previous 5 validations on growing birds that average relative daily growth rates of up to about 20% do not increase the error of estimating rCO(2) by the DLW method. Arithmetic error was significantly less when using one isotopic pool, rather than two pools, to compute rCO(2) and was less when using an assumed fractional evaporative water loss (r(G)) of 0.45 rather than an assumed r(G) of 0.25 or 0.5 (the two values used predominantly in previous DLW studies). Our study supports Speakman's (1997) suggestion that the one-pool model is more appropriate than the two-pool model for birds weighing

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