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
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

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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).
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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).
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© The Company of Biologists Ltd 2004