La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Body water dynamics at the onset of egg-laying in the Zebra Finch Taeniopygia guttata
Auteurs :	S. J. Reynolds, Auteur ; S. Waldron, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (30(1) MAR 1999)
Article en page(s) :	1-6
Langues:	Anglais
Résumé :	The body water dynamics of egg-laying Zebra Finches Taeniopygia guttata was investigated by isotopic dilution of deuterium oxide or D(2)O. Two successive doses of D(2)O were administered to each hen, once during a non-reproductive period and once at roost on the evening before the first egg was laid. A 2- to 4-week period separated repeated dosing procedures for the 10 hens under study. During prelaying, water comprised 56.2% (range: 50.1-67.1%) (or 7.82 ml[range: 6.89-9.27 ml]) of hens' body mass whereas at the onset of egg-laying, hydration of body tissues had increased dramatically to 79.8% (range: 75.0-90.2%) (or 11.92 ml [range: 10.44-12.99 ml]). The water equivalent of 47.5% of body mass was turned over per day during laying and 40.6% during prelaying. This represented a biological half-lift of the isotope of approximately

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