Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Fox, S. R.
Right arrow Articles by Smith, M. S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Fox, S. R.
Right arrow Articles by Smith, M. S.
Agricola
Right arrow Articles by Fox, S. R.
Right arrow Articles by Smith, M. S.

Biology of Reproduction, Vol 31, 619-626, Copyright © 1984 by Society for the Study of Reproduction

ARTICLES

Postpartum preovulatory surge of gonadotropin secretion in the rat may be initiated by the labor process

SR Fox and MS Smith

These studies attempted to identify the factors which stimulate the postpartum preovulatory surge of gonadotropin secretion in the rat. The time of parturition on Day 23 of pregnancy slightly affected the time of the postpartum gonadotropin surge which occurred that afternoon. Animals delivering early in the morning had postpartum gonadotropin surges earlier in the afternoon than animals delivering later in the day. To ascertain whether an afternoon time of day signal stimulates the postpartum gonadotropin surge, pentobarbital was administered immediately postpartum. Pentobarbital blocked the postpartum gonadotropin surge on the day of parturition in only 6 of 17 animals. Surprisingly, these animals all had gonadotropin surges the following day despite a large continuous suckling stimulus. To determine whether the process of parturition stimulates the postpartum gonadotropin surge, pups were delivered by cesarean section on Day 22 of pregnancy. Luteinizing hormone (LH) surges were not detected in cesarean-sectioned animals on the day of the operation, nor on the following day. However, cervical stimulation in the morning resulted in LH surges in 5 of 9 cesarean-sectioned rats later that day, at a time coincident with the afternoon time of day signal. These studies suggest that the postpartum gonadotropin surge results from an afternoon time of day signal which is activated by the cervical stimulation of the labor process.


This article has been cited by other articles:


Home page
 J EndocrinolHome page
A. Fukushima, P. Yin, M. Ishida, N. Sugiyama, and J. Arita
Pup removal suppresses estrogen-induced surges of LH secretion and activation of GnRH neurons in lactating rats.
J. Endocrinol., October 1, 2006; 191(1): 339 - 348.
[Abstract] [Full Text] [PDF]

Home page
 Biol. Reprod.Home page
T. L. McElhinny, C. L. Sisk, K. E. Holekamp, and L. Smale
A Morning Surge in Plasma Luteinizing Hormone Coincides with Elevated Fos Expression in Gonadotropin-Releasing Hormone-Immunoreactive Neurons in the Diurnal Rodent, Arvicanthis niloticus
Biol Reprod, October 1, 1999; 61(4): 1115 - 1122.
[Abstract] [Full Text]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1984 by the Society for the Study of Reproduction.