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First published online December 10, 2003
Journal of Experimental Biology 207, 263-268 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00740

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Top-down regression of the avian oviduct during late oviposition in a small passerine bird

T. D. Williams^* and C. E. Ames

Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, V5A 1S6, Canada

View larger version (15K): [in a new window]   Fig. 1. Variation in dry oviduct mass (mg) during the laying cycle in female zebra finches in relation to stage of ovarian development. 1st egg, day first egg was laid; F1 foll, one or more yolky follicles present; 0 foll, no remaining yolky follicles; ovid egg, oviductal egg present. Columns sharing the same letter are not significantly different (P>0.05).

View larger version (17K): [in a new window]   Fig. 2. Variation in dry mass of infundibulum/magnum (A), isthmus (B) and shell gland/vagina (C) during the laying cycle in female zebra finches in relation to stage of ovarian development (as for Fig 1). Columns sharing the same letter are not significantly different (P>0.05).