Uterine blood flow and uterine arterial, venous and luminal concentrations of oestrogens on Days 11, 13 and 15 after oestrus in pregnant and non-pregnant sows

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Abstract
Concentrations of estradiol-17.beta. and estrone were measured in the uterine arterial and venous blood of anesthetized sows on days 11, 13 or 15 of the estrous cycle or of pregnancy. Uterine arterial blood flow and the amounts of estradiol-17.beta. and estrone in uterine flushings were determined in the same animals. In pregnant animals arterial and venous concentrations were significantly different (P < 0.05) for estradiol-17.beta. on days 11 and 13, and for estrone on day 15. Uterine content of both steroids was consistently greater in pregnant than in non-pregnant animals with a peak on day 13. Uterine arterial blood flow increased from day 11-13 of pregnancy than declined (P < 0.08) by day 15; no change in uterine blood flow occurred on the corresponding days of the estrous cycle.