Search Results - "Youngren, O.M"

Serotonergic Stimulation of Prolactin Secretion Is Inhibited by Vasoactive Intestinal Peptide Immunoneutralization in the Turkey by El Halawani, M.E., Youngren, O.M., Rozenboim, J., Pitts, G.R., Silsby, J.L., Phillips, R.E.

“…The neuronal mechanisms that govern prolactin (PRL) secretion in the turkey appear to involve monoaminergic systems. Considerable evidence indicates that…”
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Dopamine and mesotocin neurotransmission during the transition from incubation to brooding in the turkey by Thayananuphat, A., Youngren, O.M., Kang, S.W., Bakken, T., Kosonsiriluk, S., Chaiseha, Y., El Halawani, M.E.

“…We investigated the neuroendocrine changes involved in the transition from incubating eggs to brooding of the young in turkeys. Numbers of mesotocin (MT; the…”
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Effect of reproductive condition on luteinizing hormone and prolactin release induced by electrical stimulation of the turkey hypothalamus by Youngren, O M, el Halawani, M E, Silsby, J L, Phillips, R E

“…In the turkey, the onset of incubation behavior is associated with decreased luteinizing hormone (LH) and increased prolactin (PRL). This study was designed to…”
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Involvement of dopamine in prolactin release induced by electrical stimulation of the hypothalamus of the female turkey (Meleagris gallopavo) by el Halawani, M E, Youngren, O M, Silsby, J L, Phillips, R E

“…Controversy exists regarding the role of dopamine (DA) in the regulation of avian prolactin (PRL) secretion. Consequently, we injected apomorphine, a DA…”
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Involvement of serotonin in prolactin release induced by electrical stimulation of the hypothalamus of the turkey (Meleagris gallopavo) by el Halawani, M E, Youngren, O M, Silsby, J L, Phillips, R E

“…In anesthetized female turkeys electrical stimulation of the ventromedial nucleus (VMN) for 30 min caused increases in plasma prolactin (Prl); with maximum…”
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Dopaminergic Control of Prolactin Secretion in the Turkey by Youngren, Orlan M., Pitts, Gilbert R., Phillips, Richard E., El Halawani, Mohamed E.

“…The stimulatory and inhibitory effects of dopamine (DA) upon avian prolactin (PRL) secretion suggest that, in birds, these actions are mediated by multiple DA…”
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Serotonergic Stimulation of Avian Prolactin Secretion Requires an Intact Dopaminergic System by Youngren, Orlan M., Chaiseha, Yupaporn, El Halawani, Mohamed E.

“…In order to ascertain if prolactin (PRL) secretion stimulated by serotonin (5-HT) was mediated by the dopaminergic system, both dopamine (DA) and 5-HT were…”
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The stimulatory and inhibitory effects of dopamine on prolactin secretion in the turkey by Youngren, O M, Pitts, G R, Phillips, R E, el Halawani, M E

“…Dopamine (DA) was infused into the third ventricle of anesthetized laying turkey hens at various concentrations to determine its effect on both basal prolactin…”
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Vasoactive intestinal peptide secretion by turkey hypothalamic explants by Chaiseha, Y. (University of Minnesota, St. Paul, MN.), Youngren, O.M, El Halawani, M.E

“…The objective of this study was to culture turkey hypothalami and examine vasoactive intestinal peptide (VIP) release during the turkey reproductive cycle. The…”
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Active immunization with vasoactive intestinal peptide prevents the secretion of prolactin induced by electrical stimulation of the turkey hypothalamus by Youngren, O M, Silsby, J L, Rozenboim, I, Phillips, R E, el Halawani, M E

“…Immunoneutralization of endogenous vasoactive intestinal peptide (VIP) by active immunization with chicken VIP (cVIP) reduced both basal circulating prolactin…”
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Hypothalamic and posterior pituitary content of vasoactive intestinal peptide and gonadotropin-releasing hormones I and II in the turkey hen by Rozenboim, I, Silsby, J.L, Tabibzadeh, C, Pitts, G.R, Youngren, O.M, El Halawani, M.E

“…An inverse relationship often exists between prolactin (Prl) and LH in avian species. Our study was designed to investigate the relationship between…”
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Effects of reproductive status, ovariectomy, and photoperiod on vasoactive intestinal peptide in the female turkey hypothalamus by Mauro, L J, Youngren, O M, Proudman, J A, Phillips, R E, el Halawani, M E

“…Vasoactive intestinal peptide (VIP) appears to be a physiologically relevant prolactin (PRL)-releasing factor during the avian reproductive cycle, yet little…”
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Photoperiod Mediates the Ability of Serotonin to Release Prolactin in the Turkey by Pitts, Gilbert R., Youngren, Orlan M., Phillips, Richard E., El Halawani, Mohamed E.

“…Photostimulation (PS) of turkeys increases the number of hypothalamic vasoactive intestinal peptide (VIP)-immunoreactive neurons, the number of anterior…”
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Intracranial prolactin perfusion induces incubation behavior in tukey hens by Youngren O.M, El Halawani M.E, Silsby J.L, Phillips R.E

“…Intracranial perfusion of ovine prolactin (oPrl) via osmotic pump in laying turkey hens caused a sudden onset in incubation behavior, defined as an increase in…”
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Effect of maternal passive immunization against vasoactive intestinal peptide on prolactin secretion in turkey poults by Rozenboim, I. (Hebrew University of Jerusalem, Rehovot, Israel.), Pitts, G.R, Youngren, O.M, El Halawani, M.E

“…The purpose of this study was to examine the role of vasoactive intestinal peptide (VIP) in prolactin (PRL) release in young turkey poults. Poults obtained…”
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Role of vasoactive intestinal peptide in the control of prolactin-induced turkey incubation behavior. I. Acute infusion of vasoactive intestinal peptide by Pitts, G.R, Youngren, O.M, Silsby, J.L, Foster, L.K, Foster, D.N, Rozenboim, I, Phillips, R.E, El Halawani, M.E

“…Vasoactive intestinal peptide (VIP) stimulates prolactin (PRL) secretion. Ovine PRL induces incubation behavior in avian species. This study was designed to…”
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Role of vasoactive intestinal peptide in the control of prolactin-induced turkey incubation behavior. II. Chronic infusion of vasoactive intestinal peptide by Pitts, G.R, Youngren, O.M, Silsby, J.L, Rozenboim, I, Chaiseha, Y, Phillips, R.E, Foster, D.N, El Halawani, M.E

“…Hyperprolactinemia is associated with incubation behavior in avian species. Increased nesting activity is a major indication of incubation behavior. Vasoactive…”
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Dynorphin modulates prolactin secretion in the turkey by Youngren, O M, Silsby, J L, Phillips, R E, el Halawani, M E

“…Big dynorphin (prodynorphin 209-240), dynorphin A (prodynorphin 209-225), dynorphin B (prodynorphin 228-240), beta-endorphin (beta-lipotrophin 61-90), or…”
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Effects of preoptic and hypothalamic lesions in female turkeys during a photoinduced reproductive cycle by Youngren, O.M. (University of Minnesota, Minneapolis, MN), EL Halawani, M.E, Phillips, R.E, Silsby, J.L

“…Prolactin (Prl) is released by electrical stimulation in the turkey hypothalamus and preoptic area (POA). Possible trajectories for POA efferents to the median…”
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Exogenous prolactin delays photo-induced sexual maturity and suppresses ovariectomy-induced luteinizing hormone secretion in the turkey (Meleagris gallopavo) by El Halawani, M.E. (University of Minnesota, St. Paul, MN), Silsby, J.L, Youngren, O.M, Phillips, R.E

“…A direct effect of prolactin (Prl) on gonadotropin secretion has been suggested but not convincingly demonstrated. The secretion of LH in response to…”
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