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Effect of Intra-Uterine Devices on Corpus Luteum Function

U. S. Department of Agriculture¹, Beltsville, Maryland

Abstract

Experimental evidence has accumulated within recent years indicating that foreign objects placed in the uterine lumen affect the development and maintenance of corpora lutea. Luteal function has generally been measured either by length of the estrous cycle or by luteal weight or size at some stage of the cycle.

The term "intra-uterine device" (IUD) as used in this review will refer to various objects and semisolids which have been inserted or injected into the uterine lumen for a variety of reasons. Only superficial consideration will be given to the nature of any one device. For consistency in timing the days of the estrous cycle, the first day of estrus will be considered as day 1.The "immediate cycle" will refer to that cycle during which the device was inserted. "Subsequent cycles" will be all those after the immediate one.

Most of the published material used in this review has been classified by species or groups of species.

¹ Animal Husbandry Research Division, Agricultural Research Center.