To determine whether membrane-related events may be involved in
attenuated luteal function after gonadotropin-releasing hormone (GnRH)
administration, corpora lutea (CL) were removed from 10 beef heifers on day 7
of the estrous cycle after i.v. injection of GnRH or saline on day 2 of the cycle.
Luteal slices were incubated...
Experiments were conducted to characterize the nongenomic effects of
progesterone (P4) on binding of oxytocin (OT) to the ovine oxytocin
receptor (OTR) and signal transduction. The dose-response relationship of
P4 to OT binding to the OTR in endometrium was examined. Progesterone
interfered with the binding of OT to the OTR...
Effects of progesterone (P₄) and mifepristone (RU 486) on binding
of oxytocin (OT) to its ovine uterine receptor (OTR) were studied in two
experiments. Two additional experiments were conducted to evaluate
specific binding sites for P4 in endometrial plasma membranes. In Exp.
1, ovariectomized ewes were injected with estradiol-17β (E₂)...
The role of the conceptus and ovarian hormones in regulating ovine uterine vasoconstriction was investigated. The uterine artery ipsilateral to the ovary bearing the corpus luteum in ten nonpregnant and eight pregnant ewes was utilized in two experiments. Arteries of nonpregnant and pregnant ewes were removed at necropsy on day...
The effects of suckling on several ovarian characteristics were
studied in postpartum rabbits. Ovarian weight was found to be significantly
greater in rabbits suckled for twelve days than in nonsuckled
rabbits autopsied at a similar interval postpartum or in a third group
autopsied at parturition. There were no significant differences...
The relationship of glucocorticoid secretion to light-induced,
early-winter priming of pelage in ranch mink was investigated. Sixteen
Standard Dark, mature, female mink were exposed to natural light conditions
of 45° North latitude beginning on December 13, 1977. A 2x4 cm
area of the right hip of each animal was sheared...
Some effects of 171β-estradiol on ovine luteal function were
studied in five experiments.
Estradiol injected into ewes on days 11 and 12 of the estrous
cycle caused luteal regression in both intact and unilaterally hysterectomized
ewes indicating that the presence of one uterine horn permits
estradiol to cause luteolysis comparable...
Two experiments were conducted utilizing crossbred gilts to evaluate follicle characteristics at puberty and to determine the effect of exogenous estradio1-17β on embryonic mortality in the mature cycling gilt. Experiment 1 was conducted to compare preovulatory follicle numbers and sizes and follicular fluid concentrations of progesterone, estradio1-17β, plasminogen activator and...
Two distinct experiments were conducted. Experiment 1
was conducted to investigate the effects of nutritional
conditioning and flushing as a means of improving reproductive
performance of female mink. In Exp. 2, vegetable oil and corn
syrup were fed during lactation to ascertain whether this
nutritional regimen would improve growth of...