Abstract
Summary
The progesterone concentration in peripheral plasma of sham-operated guinea pigs increased significantly during the estrous cycle from a nondetectable concentration at estrus to a maximum concentration on day 10, followed by a rapid decline. In the presence of an IUFB in both uterine horns, the progesterone concentration did not increase after day 4 of the cycle. Over the next 8 days, a slow decline in concentration occurred. The length of the estrous cycle was significantly shorter in animals having IUFB than in sham-operated animals.
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