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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).