Attempts to compare the pattern of myometrial activity in restrained, fully conscious, control and IUD rhesus monkeys by using a chronically implanted, strain-gauge transducer attached to the external surface of the uterus, were not successful.
'Egg transfers' were made to the uterus on Days 15 and 18 of the menstrual cycle using fertilized rabbit eggs and radio-active silver-110m-coated, resin spheres as natural and artificial substitutes for monkey eggs. There was no marked difference in the rate of egg recovery from control and IUD monkeys at 48 hr after transfer.
It was concluded that premature expulsion of the eggs from the uterus was not the principal contraceptive effect of an IUD in the rhesus monkey.
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