| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Biology of Reproduction, Vol 4, 174-184, Copyright © 1971 by Society for the Study of Reproduction
1 Department of Biology, Linfield Research Institute, Linfield College, McMinnville, Oregon 97128, and
Department of Biological Structure School of Medicine, University of
Washington, Seattle, Washington 98105 The time required for 249 supravitally stained donor eggs to pass through the ampullae
of the oviducts has been determined for 31 rabbits arranged in six groups as follows: 45 ova
in eight normal rabbits in estrus, mean transport time 9.4 ± 1.6 mm (SD) (number of rabbits used as n for determination of SD); 56 ova in seven normal estrous rabbits 10-15 hr after
an ovulation-inducing injection of HCG, mean transport time 6.1 ± 1.5 min; 43 ova in five
normal estrous rabbits 12-14 hr after an injection of 20 The mean ovum transport time was significantly longer (p < 0.01) in the rabbits in estrus
than in any of the other groups. Ampullary muscle contractions were more coordinated and
vigorous in rabbits at the time of a gonadotrophin-induced ovulation or after progestin
injection than in unstimulated does in estrus. Muscle contractions 19-20 hr after ovariectomy and 12-14 hr after injection of a synthetic estrogen antagonist, CN-55, 945-27, were as
vigorous as those observed at the time of ovulation and after progestin injections in normal
estrous rabbits, but, in general, the contractions were not as well programmed as contractions which occur at ovulation in the normal animal. Muscle contractility of the ampulla was minimal, and the egg transport was slower in
normal, unstimulated, estrous rabbits at a time when estrogens in the plasma and target
tissues are presumed to be at a relatively high level. There is an increasing body of data
indicating a significant increase in the secretion of progestins in the ovaries as ovulation
approaches. We suggest that the increase in vigor and orderly programming of muscle contraction as well as the acceleration of egg transport at the time of ovulation may be related
to an increase in the secretion of progestins and a fall in the level of estrogens.
-OH-progesterone, mean transport time 4.2 ± 0.5 min; 31 ova in four normal estrous rabbits 12-14 hr after an injection
of progesterone, mean transport time 4.3 ± 1.0 min; 45 ova in four normal estrous rabbits
19-20 hr after ovariectomy, mean transport time 3.7 ± 0.5 min; 29 ova in three normal
estrous rabbits 12-14 hr after injection of an estrogen antagonist (CN-55, 945-27), mean
transport time 4.3 ± 1.7 min.
This article has been cited by other articles:
|
|
 |
|
  R. Jansen Fallopian tube isthmic mucus and ovum transport Science, July 28, 1978; 201(4353): 349 - 351. [Abstract] [PDF]
|
|
|
|
|
|
S. Halbert, P. Tam, and R. Blandau Egg transport in the rabbit oviduct: the roles of cilia and muscle Science, March 12, 1976; 191(4231): 1052 - 1053. [Abstract] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
