EFFECT OF DIBENAMINE ON PROGESTERONE-INDUCED AND “SPONTANEOUS” OVULATION IN THE HEN1

Abstract
Using the first egg of a clutch in regularly laying hens, it was shown that Dibenamine is capable of blocking spontaneous as well as progesterone-induced ovulations. It was shown that a neural mechanism is involved in spontaneous as well as in progesterone-induced ovulations. Dibenamine blocks spontaneous ovulations most effectively when injected 14 hours before ovulation and is progressively less effective at 10, 8, 6, and 4 hours. At 12 hours, an unexplained low rate of blocking was observed.