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THE FERTILITY OF EWES AFTER IMPLANTATION OF DUMMY PRESSURE TRANSDUCERS IN THE UTERINE WALL

Foreign bodies inserted into the uterine lumen of ewes act as contraceptives (Hawk, 1965, 1967). A sensor used for monitoring uterine contractions in the non-pregnant ewe in vivo should not, therefore, be implanted in the lumen when minimal interference with normal reproductive function is desired. The following experiments were carried out in order to test the possibility of maintaining the capacity to conceive by implanting the sensor in the uterine wall rather than in the lumen.

Dummies were made of perspex in the shape and size of the real pressure transducers which were to be used (Text-fig. 1). The uteri of cycling, non-lactating, Awassi ewes were exposed at laparotomy and incisions about 1 cm long were made on the dorsal wall through the serosa into the myometrium. An additional incision at right angles to the first was made in the myometrium beneath the serosa. Dummies were inserted in