Πλοήγηση ανά Θέμα "GONADOTROPIN-RELEASING-HORMONE"
Αποτελέσματα 1-17 από 17
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Assisted reproductive technologies in the reproductive management of small ruminants
(2012)In modern agriculture, assisted reproductive technologies are being used for out of season oestrus induction, enhancement of reproductive performance and genetic improvement. In addition, they can have substantial contribution ... -
Attenuating activity of the ovary on LH response to GnRH during the follicular phase of the cycle
(2014)Objective Oestradiol sensitizes the pituitary to GnRH, while gonadotrophin surge attenuating factor (GnSAF) may oppose this action. Using the LH response to GnRH during treatment with FSH as an in vivo bioassay for GnSAF, ... -
Attenuation of the oestrogen positive feedback mechanism with the age in postmenopausal women
(2015)ObjectiveIt has been reported that the positive feedback mechanism of oestrogens and progesterone is preserved, although attenuated, in late postmenopausal years. Whether this is also true for the positive feedback effect ... -
Current and future status of ovulation induction in polycystic ovary syndrome
(1997)Great progress has been achieved during the last 20 years in the field of ovulation induction in patients with polycystic ovary syndrome (PCOS). Clomiphene citrate remains the first line of treatment for all anovulatory ... -
Evidence of differential control of FSH and LH responses to GnRH by ovarian steroids in the luteal phase of the cycle
(2002)BACKGROUND: It is known that during the follicular phase of the cycle, estradiol sensitizes the pituitary to GnRH. The aim of this study was to determine the role of ovarian steroids in the control of GnRH-induced gonadotrophin ... -
Evidence that termination of the estradiol-induced luteinizing hormone surge in women is regulated by ovarian factors
(2006)Background: The endogenous LH surge is the result of the estrogen-positive feedback effect. However, the factors that are responsible for the termination of LH surge are not known. Objective: The objective of the study was ... -
Failure of the GnRH antagonist ganirelix to block the positive feedback effect of exogenous estrogen in normal women
(2010)This study investigated whether the GnRH antagonist ganirelix is able to block the positive-feedback effect of E-2 in normal women. Ganirelix was unable to block the positive-feedback effect, suggesting that the clinical ... -
From menarche to regular menstruation - Endocrinological background
(2006)Marked changes in hormone secretion occur from childhood to adulthood. Prior to puberty gonadotropin-releasing hormone (GnRH) secretion is markedly suppressed. At the onset of puberty, the hypothalamic gonadostat is ... -
FSH and LH responses to GnRH after ovariectomy in postmenopausal women
(2004)OBJECTIVE Whether the postmenopausal ovary is still playing a role in the control of gonadotrophin secretion in response to GnRH has not been investigated. The aim of the present study was to test this hypothesis by examining ... -
Ghrelin: New Insights into Female Reproductive System-Associated Disorders and Pregnancy
(2012)Ghrelin is considered the endogenous ligand of growth hormone secretagogue receptor type 1a, and its modulatory actions have been demonstrated in a large array of endocrine and nonendocrine functions. According to recent ... -
Human ghrelin decreases pituitary response to GnRH in superovulated ewes
(2013)In addition to its metabolic role, ghrelin has been found to suppress luteinizing hormone secretion in many species acting mainly at the hypothalamic level. The objectives of the present study were to test the hypothesis ... -
Modulatory effect of the ovary on LH secretion
(2003)Ovarian steroids are important regulators of gonadotropin secretion during the normal menstrual cycle. Estradiol is the predominant factor in the follicular phase, while progesterone plays an important role in the luteal ... -
Novel aspects of the endocrinology of the menstrual cycle
(2014)Ovarian control of gonadotrophin secretion is normally achieved via the feedback mechanisms mediated by oestradiol and progesterone. Evidence has been provided that nonsteroidal substances, such as inhibin A and B, participate ... -
Ovarian feedback, mechanism of action and possible clinical implications
(2006)The secretion of gonadotrophins from the pituitary in women is under ovarian control via negative and positive feedback mechanisms. Steroidal and non-steroidal substances mediate the ovarian effects on the hypothalamic-pituitary ... -
Ovulation induction: a mini review
(2005)Ovulation induction is the method for treating anovulatory infertility. For patients with hypogonadotrophic hypogonadism,the treatment involves administration of both FSH and LH, while HCG is injected for follicle rupture. ... -
The progesterone positive feedback effect in women after ovariectomy
(2013)Various ovarian substances regulate the secretion of gonadotrophins during the menstrual cycle, but there are still several unclarified issues. The aim of this study was to investigate the positive feedback effect of ... -
Reproductive efficiency of three estrus synchronization schemes comprising fixed-time insemination in dairy cows
(2000)The objective of this field trial was to compare the odds of pregnancy at 25 days (P25) and at 60 days (P60), of embryonic death (ED) between 25 and 60 days, and of non-pregnant cows returning to heat 20-25 days after ...