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

Authors

S. P. Ford, Iowa State University
R. K. Christensen, Roman L. Hruska U.S. Meat Animal Research Center
J. J. Ford, Roman L. Hruska U.S. Meat Animal Research Center

Date of this Version

1982

Comments

Published in J. Reprod. Fert. (1982) 64, 185-190

Abstract

Concentrations of oestradiol-17β and oestrone were measured in the uterine arterial and venous blood of anaesthetized sows on Days 11, 13 or 15 of the oestrous cycle or of pregnancy. Uterine arterial blood flow and the amounts of oestradiol-17β and oestrone in uterine flushings were determined in the same animals. In pregnant animals arterial and venous concentrations were significantly different (P < 0·05) for oestradiol-17β on Days 11 and 13 and for oestrone 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 to 13 of pregnancy then declined (P < 0·08)by Day 15; no change in uterine blood flow occurred on the corresponding days of the oestrous cycle.