The change in oestrogen and progesterone levels triggers adovarian propulsive movement of the hamster oviduct.

Effects of oestrogen and progesterone on oviduct movement were observed in vivo in ovariectomized hamsters. Continuous administration of oestradiol via implanted Silastic tubing did not induce co-ordinated propulsive movement of the oviduct towards the ovary, but the withdrawal of the hormone did. The most efficient adovarian propulsion was observed when the withdrawal of oestradiol was combined with progesterone administration. Progesterone alone did not stimulate this type of movement.