THE INCIDENCE OF DELAYED OVULATIONS FOLLOWING ABDOMINAL OPERATIONS IN THE DOMESTIC HEN

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Abstract
INTRODUCTION WE SHOWED recently (Rothchild and Fraps, 1945) that abdominal operations in the domestic hen were capable of inducing follicular atresia and that the incidence of this effect was inversely related to the frequency of ovulation preceding the operation. It was also noted in this report that the oldest preovulatory follicle showed what seemed to be a delayed ovulation in a large percentage of those birds which failed to undergo atresia following operation. This effect has been further investigated and confirmed, and is reported on in detail in the present communication.