Browsing by Subject "GnRH"
Now showing items 1-9 of 9
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Comparison of Follicular and Luteal Dynamics in Protocols Developed for Synchronization of Ovulation in Bos indicus-Influenced Beef Cows: The Role of Gonadotropin-Releasing Hormone at Treatment Onset
(2018-05-27)The 5-day Bee Synch + CIDR (Bee Synch) protocol for Bos indicus-influenced cows utilizes CIDR, GnRH (GnRH-1) and PGF on day 0 to eliminate mature corpora lutea, with FTAI and GnRH (GnRH-2) at 66 hours after CIDR removal ... -
Effects of continuous treatment with gonadotropin-releasing hormone during the anovulatory season on gonadotropin secretion, follicular dynamics and ovulation in the mare
(Texas A&M University, 2005-02-17)Objectives were to determine if low-dose, continuous infusion of GnRH from Fall to Spring, would prevent seasonal anovulation in mares. Twenty Quarter Horse mares, ages 18 mo to 24 yrs, were stratified by age and body ... -
Endogenous Cortisol, Luteinizing Hormone, and Testosterone Secretion and GnRH-induced Luteinizing Hormone and Testosterone Secretion in Prenatally Stressed Sexually Mature Brahman Bulls
(2014-12-12)The purpose of this experiment was to determine the effects of prenatal transportation stress (PNS) on LH, testosterone, and cortisol secretion before and after GnRH stimulation in sexually mature Brahman bulls. Forty-eight ... -
Interactive Roles of Gonadotropin-Releasing Hormone and RF-Amide Related Peptide 3 in Adenohypophyseal Physiology and Reporduction in the Mare
(2013-01-28)The seasonal termination of ovarian cycles in mares initiated near the time of the autumnal equinox is a significant managerial issue for horse breeders world-wide. Studies presented herein had two over-arching aims. In ... -
Reproductive neuroendocrine function in the mare as reflected in the intercavernous sinus during ovulatory, anovulatory, and transitional seasons
(Texas A&M University, 2006-08-16)We hypothesized that marked reductions in secretion of luteinizing hormone (LH) during transitional and anovulatory periods can be accounted for by similar reductions in hypothalamic gonadotropin-releasing hormone (GnRH) ... -
Role of an Equine Homologue of Gonadotropin-Inhibiting Hormone in Controlling Sectretion of Luteinizing Hormone in the Mare
(2012-07-16)Four experiments were conducted to test the hypothesis that RF-amide related peptide 3 (RFRP3) negatively regulate the secretion of LH in mares. In Exp. 1, mares received native gonadotropin-releasing hormone (GnRH) ... -
Role of leptin in regulating the bovine hypothalamic-gonadotropic axis
(Texas A&M University, 2004-09-30)The physiological mechanisms through which nutrition mediates its effects in controlling reproduction are not well characterized. Both neural and endocrine components have been implicated in the communication of nutritional ... -
Roles of Estradiol and a Putative Neuropeptide FF Receptor Antagonist, RF9 in Regulating Gonadotropin Secretion in the Cyclic and Seasonally Anovulatory Mare
(2016-01-11)Seasonal reproduction is highly correlated with circulating concentrations of luteinizing hormone (LH) in mares and low peripheral concentrations of LH serve as the primary basis for ovarian quiescence during the non-breeding ... -
The Effects of Estradiol-17beta in Modulating Pituitary-Ovarian Responsiveness to Continuous Infusion of Gonadotropin-Releasing Hormone in Winter Anovulatory Mares
(2017-12-10)Continuous infusion with native gonadotropin-releasing hormone (GnRH) restores follicular growth and ovulation in approximately 85% of winter anovulatory mares. However, the potential role of estradiol-17β (E2) in enhancing ...