Temporal relations between plasma concentrations of luteinizing hormone, follicle-stimulating hormone, estradiol-17β, progesterone, prolactin, and α-melanocyte-stimulating hormone during the follicular, ovulatory, and early luteal phase in the bitch

2006 ◽  
Vol 65 (7) ◽  
pp. 1346-1359 ◽  
Author(s):  
J. de Gier ◽  
H.S. Kooistra ◽  
S.C. Djajadiningrat-Laanen ◽  
S.J. Dieleman ◽  
A.C. Okkens
Keyword(s):  
Luteinizing Hormone ◽  
Luteal Phase ◽  
Follicle Stimulating Hormone ◽  
Plasma Concentrations ◽  
Temporal Relations ◽  
Melanocyte Stimulating Hormone ◽  
Estradiol 17Β ◽  
Stimulating Hormone

RELEASE OF GONADOTROPHIN IN OVARIECTOMIZED MICE AFTER EXPOSURE TO MALES

1969 ◽  
Vol 44 (3) ◽  
pp. 293-297 ◽  
Author(s):  
F. H. BRONSON ◽  
C. DESJARDINS
Keyword(s):  
Luteinizing Hormone ◽  
Follicle Stimulating Hormone ◽  
Plasma Concentrations ◽  
Neural Pathway ◽  
Ovariectomized Mice ◽  
Oestradiol Benzoate ◽  
Stimulating Hormone

SUMMARY Gonadectomized female C57BL/6J mice were caged with males to determine the effect of male stimuli on release of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Concentrations of hypophysial and plasma FSH were significantly higher after 3 days of exposure to males when compared with controls maintained in the absence of a male. Hypophysial and plasma concentrations of LH were also higher in females caged with males, but not significantly so. Ovariectomized females were given 0·01 μg. oestradiol benzoate daily for 4 days in a second experiment and the effect of cohabitation re-evaluated. There were no significant effects of exposure to males on either FSH or LH after the oestradiol injections. Therefore the presence of males enhances synthesis and release of FSH in gonadectomized females. In addition, the results of the second experiment suggest that oestrogen interferes with this response in some way, possibly blocking the neural pathway utilized by male stimuli.

Normal Menstrual Cycle

2018 ◽  
Author(s):  
Rebecca Pierson ◽  
Kelly Pagidas
Keyword(s):  
Menstrual Cycle ◽  
Luteinizing Hormone ◽  
Luteal Phase ◽  
Follicle Stimulating Hormone ◽  
Follicular Phase ◽  
Gonadotropin Releasing Hormone ◽  
Hormonal Control ◽  
Releasing Hormone ◽  
Normal Menstrual Cycle ◽  
Stimulating Hormone

A normal menstrual cycle is the end result of a sequence of purposeful and coordinated events that occur from intact hypothalamic-pituitary-ovarian and uterine axes. The menstrual cycle is under hormonal control in the reproductively active female and is functionally divided into two phases: the proliferative or follicular phase and the secretory or luteal phase. This tight hormonal control is orchestrated by a series of negative and positive endocrine feedback loops that alter the frequency of the pulsatile secretion of gonadotropin-releasing hormone (GnRH), the pituitary response to GnRH, and the relative secretion of luteinizing hormone and follicle-stimulating hormone from the pituitary gonadotrope with subsequent direct effects on the ovary to produce a series of sex steroids and peptides that aid in the generation of a single mature oocyte and the preparation of a receptive endometrium for implantation to ensue. Any derailment along this programmed pathway can lead to an abnormal menstrual cycle with subsequent impact on the ability to conceive and maintain a pregnancy. This review contains 7 figures and 26 references Key words: follicle-stimulating hormone, follicular phase, gonadotropin-releasing hormone, luteal phase, luteinizing hormone, menstrual cycle, ovulation, progesterone, proliferative phase, secretory phase

Effects of high levels of body condition and food intake on plasma follicle stimulating hormone, luteinizing hormone, prolactin and progesterone profiles around mating in Greyface ewes

1986 ◽  
Vol 43 (1) ◽  
pp. 101-107 ◽  
Author(s):  
S. M. Rhind ◽  
I. D. Leslie ◽  
R. G. Gunn ◽  
J. M. Doney
Keyword(s):  
Luteinizing Hormone ◽  
Body Condition ◽  
Luteal Phase ◽  
Weight Maintenance ◽  
Follicle Stimulating Hormone ◽  
Live Weight ◽  
Follicular Phase ◽  
High Group ◽  
High Level ◽  
Stimulating Hormone

ABSTRACTTwo groups of 19 Border Leicester cf × Scottish Blackface 9 ewes were fed so that ewes of one group were in a very high level of body condition at mating (mean score 3·35) and had a high level of intake. Ewes of the second group were in moderately high condition (mean score 2·74) and were given a live-weight maintenance ration. Ewes in the high group had a higher ovulation rate than those of the moderate group (3·36 v. 2·33) but a lower number of embryos per ewe mated (1·16 v. 1·42). Mean follicle stimulating hormone profiles were similar for ewes of the two groups during the luteal and follicular phases of the cycle before mating and during the subsequent oestrus. Mean prolactin concentrations were higher in ewes of the high group during the follicular phase and oestrus but not during the luteal phase. Mean luteinizing hormone (LH) concentrations were higher in ewes of the high group during the follicular phase and oestrus but not during the luteal phase. Mean LH concentrations were similar for the two groups at all times but the frequency of LH pulses was higher in the high group during the follicular phase.Ewes that were not pregnant at slaughter had abnormal progesterone profiles following mating, abnormal pre-ovulatory LH surges or failed to show oestrus. These abnormalities were not related to gonadotrophin profiles prior to oestrus.

Ovarian responses of anestrous ewes to the "ram effect"

2002 ◽  
Vol 82 (4) ◽  
pp. 599-602 ◽  
Author(s):  
R. Ungerfeld ◽  
A. Pinczak ◽  
M. Forsberg ◽  
E. Rubianes
Keyword(s):  
Luteinizing Hormone ◽  
Key Words ◽  
Luteal Phase ◽  
Follicle Stimulating Hormone ◽  
Lh Surge ◽  
Follicular Cyst ◽  
Ram Effect ◽  
Ovulatory Follicles ◽  
Follicular Dynamics ◽  
Stimulating Hormone

Ovarian responses to the "ram effect" were characterized in 11 anestrous Corriedale ewes. In seven ewes, there was a luteinizing hormone (LH) surge 36.7 ± 12.3 h (mean ± SEM) after ram introduction and a concurrent increase (P < 0.05) in serum follicle stimulating hormone (FSH). Ovarian responses (monitored ultrasonographically) were highly variable. One ewe had two luteal phases (short and normal, respectively), three had delayed ovulation (days 5–7), two had luteinization of non-ovulatory follicles, one developed a luteinized follicular cyst, and four had no luteal phase. Key words: Ram effect, ovarian follicular dynamics, seasonal anestrus, ultrasonography, gonadotropin

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