The role of the pituitary gland and uterus in regulating ovarian
function in the estradiol-treated gilt and ewe was investigated in two
experiments.
Pituitary gonadotropin content, ovarian follicular development and
corpus luteum function were studied following daily intramuscular
injection of seven gilts with 7 mg of 17β-estradiol from day 11...
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...
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...
The role of estradiol- 17β, progesterone and prostaglandin F₂α (PGF₂α) in altering contractility of uterine vascular smooth muscle was investigated. A segment of uterine artery (3. 5 cm) supplying each uterine horn of ewes and heifers were removed at necropsy and perfused with oxygenated Krebs Henseleit Solution prior to initiating...
The binding of estrogen to endometrium and uterine arteries of the ewe was investigated by use of a [³H]estradiol exchange assay and by incubating whole tissue aliquants with [³ H]estradiol, a method which permits quantification of bound estrogen translocated from the cytoplasm to the nucleus. Five ewes were necropsied on...
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 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...
A local effect of endogenous ovarian hormones on the
in vitro responses of the bovine infundibulum to the
neurotransmitters norepinephrine (NE) and acetylcholine
(Ach) was investigated. Prostaglandin F₂α-tham salt was
utilized to induce luteal regression in six heifers
which were necropsied during proestrus. Six heifers were
also necropsied during the...
The mechanism(s) involved with intrauterine migration of the porcine embryo was investigated. Twenty-four gilts on Days 6, 9 and 12 of gestation (Day 0 = 1st day of estrus) were utilized to examine the relationship between myometrial activity and intrauterine migration. On Day 2, embryos were flushed from one oviduct...