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INTRA-UTERINE FOREIGN BODY AND PREGNANCY IN PIGS

Experimental control of fertility has been accomplished by inserting foreign objects in the uterus. Doyle & Margolis (1963) found that a suture in the uterine lumen of the rat prevented implantation of blastocysts. This was soon followed by similar studies on the rabbit (Adams & Eckstein, 1964), cow (Hawk, Conley, Brinsfield & Righter, 1965) and ewe (Hawk, 1965). A local inhibitory effect on luteal function has been demonstrated by inserting plastic coils in an anterior portion of a uterine horn in the ewe (Ginther, Pope & Casida, 1966) and heifer (Ginther, Woody, Janakiraman & Casida, 1966). Uterine distention does not alter oestrous cycles in the pig (Anderson, 1962); however, a local uterine luteolytic effect has been observed during pregnancy (du Buisson, 1961). This investigation concerns the effect of an intra-uterine foreign body