Local increase of ovarian steroid hormone concentration in blood supplying the oviduct and uterus during early pregnancy of sows
| Autor: | T. Krzymowski, Stanisława Stefańczyk-Krzymowska, B. Wasowska, Janina Skipor, W. Grzegorzewski |
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| Rok vydání: | 1998 |
| Předmět: |
medicine.medical_specialty
Estrone Swine Uterus Ovary Biology Catheterization chemistry.chemical_compound Food Animals Pregnancy medicine.artery Internal medicine medicine Animals Testosterone Gonadal Steroid Hormones Small Animals Uterine artery Fallopian Tubes Estrous cycle Equine Androstenedione Arteries Endocrinology medicine.anatomical_structure chemistry Pregnancy Animal Oviduct Female Animal Science and Zoology Jugular Veins Corpus luteum Hormone |
| Zdroj: | Theriogenology. 50:1071-1080 |
| ISSN: | 0093-691X |
| Popis: | Countercurrent transfer in the ovarian vascular pedicle elevates the concentration of steroid hormones in blood supplying the oviduct and periovarian part of the uterus during the estrous cycle in the pig. This study was conducted to determine whether during early pregnancy the arterial blood supply to the oviduct and uterus carries greater concentration of steroid hormone than systemic blood. The concentration of ovarian steroid hormones (progesterone, estradiol-17 beta, estrone, androstenedione and testosterone) was measured in 40 gilts on Days 12, 18, 25 or 35 of pregnancy. Silastic catheters were inserted: a) into the jugular vein, b) into the branch of uterine artery close to the ovary (proximal to the ovary) and c) into the branch of the uterine artery close to the cervix (distal to the ovary). On the day following surgery simultaneous blood samples from cannulated vessels were collected every 20 min for 3 hours. The concentration of steroid hormones was determined by radioimmunoassay. The mean concentrations of studied hormones in branches of the uterine artery proximal and distal to the ovary were significantly greater than in the jugular vein (P < 0.001) by 18 to 69% and 7 to 31%, respectively. The concentrations of hormones in proximal and distal to the ovary branch of the uterine artery were also significantly different (P < 0.001). The increase in concentrations of the measured hormones did not differ considerably between investigated days of pregnancy. It is concluded that during maternal recognition of pregnancy, formation of the corpus luteum of pregnancy, implantation of the embryo and the placenta elongation the oviduct and uterus are supplied with locally elevated concentration of steroid hormones compared to systemic blood. |
| Databáze: | OpenAIRE |
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