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STIMULATION BY INTRA-UTERINE DEVICES OF MOTILITY OF SHEEP MYOMETRIUM

Summary.: Motility in vitro was greatest in strips of myometrium from oestrous ewes, intermediate in strips from ovariectomized ewes and least in strips from luteal phase ewes. The presence of a spiral in the uterine lumen in vivo increased the amplitude of contractions for ewes of each endocrine state; the increase was greatest for ovariectomized ewes. Frequency of contractions was not changed significantly. The increased amplitude was localized for the most part to the uterine horn containing the spiral.