Chronic utero-ovarian vein catheterization with subsequent occlusion prolongs the estrous cycle and changes electromyographic activity in the myometrium of ewes

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The objective of our study was to determine the effect of chronic utero-ovarian vein catheterization in ewes on estrous cycle length, plasma progesterone (P) concentration, and myometrial electromyographic activity. Cyclic ewes with inferior vena cava catheters were used as controls. Estrus was synchronized in ten ewes and 10 to 12 d following estrus, the ewes were anesthetized, fitted with myometrial electromyograph leads and with utero-ovarian vein (n = 5) or inferior vena cava (n = 5) catheters. After surgery, ewes returned to estrus as expected (16 to 18 d interestrus interval). The second cycle of four of five ewes with utero-ovarian vein catheters were prolonged (40 to 58 d). The inferior vena cava catheterized ewes had normal length second cycles. Plasma P concentrations reflected the estrous cycles: low (≤ 0.01 ng/ml) at estrus and 2 to 3 ng/ml at midcycle. The inferior vena cava catheterized ewes had decreased plasma P concentrations after luteolysis (Days 13 to 14) while four of five utero-ovarian vein catheterized ewes maintained elevated plasma P concentrations for 20 to 58 d. Catheterization affected the myometrial electromyograph; short events (16 to 180 sec) were increased on Days 5 to 13 in utero-ovarian vein as compared with inferior vena cava catheterized ewes (P < 0.05); long events (180 to 900 sec) tended to decrease from Days 1 to 15 in utero-ovarian vein ewes, but this was not statistically significant (P > 0.05).

Original languageEnglish (US)
Pages (from-to)735-747
Number of pages13
JournalTheriogenology
Volume34
Issue number4
DOIs
StatePublished - Oct 1990
Externally publishedYes

Keywords

  • catheterization
  • ewe
  • myometrium
  • progesterone
  • uterus

ASJC Scopus subject areas

  • Small Animals
  • Food Animals
  • Animal Science and Zoology
  • Equine

Fingerprint Dive into the research topics of 'Chronic utero-ovarian vein catheterization with subsequent occlusion prolongs the estrous cycle and changes electromyographic activity in the myometrium of ewes'. Together they form a unique fingerprint.

Cite this