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ALTERATION OF UTERINE MOTILITY IN THE EWE BY AN INTRAUTERINE DEVICE

Hawk (1967) reported that an intrauterine device (IUD) in one uterine horn blocked sperm transport, and thus fertilization, on both sides of the ovine reproductive tract. Although this effect seemed to be due to a change in uterine motility, attempts to counteract the contraceptive effect of an IUD were unsuccessful (Warren & Hawk, 1968). Furthermore, it was reported that an IUD altered uterine activity in vitro only in ovariectomized animals (Brinsfield & Hawk, 1968). Brinsfield & Hawk (1969) and Mann (1969) have observed that the direction of uterine contractions is reversed in IUD-bearing animals. The present study was undertaken to determine if an IUD caused changes in the amplitude of uterine contractions as well as a change in the direction of contractions. Preliminary data