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EFFECT OF AN INTRA-UTERINE DEVICE ON GAMETE TRANSPORT AND FERTILIZATION IN THE RHESUS MONKEY

Summary.: In the naturally cyclic rhesus monkey, the presence of an intra-uterine device (IUD) did not obviously disturb the processes of (a) transport of the ovulated egg through the Fallopian tube; (b) transport of spermatozoa through the female genital tract; (c) fertilization, and (d) early embryonic development within the Fallopian tube.

Correlation of observations on egg recovery with those on the morphological age of the corpus luteum suggested that transport of the naturally ovulated egg through the Fallopian tube was completed within 3 to 4 days after ovulation in both the control and IUD monkeys.

Eggs could be recovered from the uteri of control monkeys, but usually not from those of IUD monkeys. It was concluded that the presence of an IUD probably induced pre-implantation destruction of embryos within the uterus of the naturally cyclic rhesus monkey.