La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Timing of moult in male and female shelducks Tadorna tadorna: Effects of androgens and mates
Auteurs :	H. Duttmann, Auteur ; S. Dieleman, Auteur ; T. G. G. Groothuis, Auteur
Type de document :	Article
Dans :	Ardea (87(1) 1999)
Article en page(s) :	33-39
Résumé :	We investigated effects of testosterone treatment on timing and rate of moult of wing-feathers in male Shelducks Tadorno tadorna, and whether this treatment influences the timing of moult in untreated females. Three experimental treatments were conducted, each with two groups of sexual inactive male Shelducks, which were kept under natural photoperiods in The Netherlands. Each group consisted of two pairs and a single male. Males received implants with testosterone-proprionate for seven weeks shortly before the natural moult onset of wing-feathers. Start of treatment was 27 June (treatment I), 5 July (treatment II), and

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