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Influence of an Intrauterine Device on Ovarian Activity in the Ewe¹

University of Wisconsin, Madison

Abstract

An intrau terine device (IUD) was inserted ipsilaterally or contralaterally to the corpus luteum of unilaterally ovulating ewes on day 1 or 4 of an estrous cycle. The mean inter-ovulatory interval for three of the groups (day 1, ipsilateral, 6.9 days; day 1, contralateral, 8.5 days; day 4, ipsilateral, 10.6 days) did not differ statistically from each other, but were shorter (P<.05) than the mean interval for the day 4, contralateral group (17.2 days) or the mean interval for a non-treated group (17.4 days). The mean interval for the day 4, contralateral group did not differ statistically from that of the non-treated group.

The incidence of ovulation without detection of estrus in the treated groups was determined by periodic laparotomy. The incidence of quiet ovulation in IUD-treated ewes (8/32) was greater (P<.05) than the apparent incidence of quiet ovulation in non-treated ewes(0/29).

¹ Paper No. 550 from the Veterinary Science Department published with approval of the Director of the Agricultural Experiment Station.