Search Results - "El Halawani, M.E."

The effect of monochromatic photostimulation on growth and development of broiler birds by Rozenboim, I, El Halawani, M.E, Kashash, Y, Piestun, Y, Halevy, O

“…Highlights • In ovo and Post hatch GL photostimulation enhance growth and muscle development. • Elevation muscle transcription & growth factors increase…”
Get full text

Dopamine-melatonin neurons in the avian hypothalamus controlling seasonal reproduction by Kang, S.W, Thayananuphat, A, Bakken, T, El Halawani, M.E

“…Abstract Day length cues are used by temperate zone birds to time seasonal changes in reproductive physiology and behavior. However, the neuronal and…”
Get full text

Melanopsin expression in dopamine-melatonin neurons of the premammillary nucleus of the hypothalamus and seasonal reproduction in birds by Kang, S.W, Leclerc, B, Kosonsiriluk, S, Mauro, L.J, Iwasawa, A, El Halawani, M.E

“…Abstract Melanopsin (OPN4) is a photoreceptive molecule regulating circadian systems in mammals. Previous studies from our laboratory have shown that…”
Get full text

Active Immunization against Vasoactive Intestinal Peptide Prevents Photo-Induced Prolactin Secretion in Turkeys by El Halawani, M.E., Pitts, G.R., Sun, S., Silsby, J.L., Sivanandan, V.

“…Photostimulation initiates and maintains the rise in circulating prolactin (PRL) observed during the reproductive cycle of the female turkey. Vasoactive…”
Get full text

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…”
Get full text

Enhanced vasoactive intestinal peptide-induced prolactin secretion from anterior pituitary cells of incubating turkeys (Meleagris gallopavo) by el Halawani, M E, Silsby, J L, Mauro, L J

“…During incubation, female turkeys exhibit elevated circulating prolactin (PRL) which may be the result of enhanced pituitary responsiveness to vasoactive…”
Get more information

Evidence of a role for the turkey posterior pituitary in prolactin release by el Halawani, M E, Silsby, J L, Koike, T I, Robinzon, B

“…The aims of this study were: (1) to examine whether the posterior pituitary contains prolactin releasing factor (PRF) activity, (2) to determine to what extent…”
Get more information

Method for collecting semen from the ostrich (Struthio camelus) and some of its quantitative and qualitative characteristics by Rozenboim, I, Navot, A, Snapir, N, Rosenstrauch, A, El Halawani, M.E, Gvaryahu, G, Degen, A

“…1. Four methods of semen collecting that involved interruption of mating in two breeding ostrich pairs were tested: an artificial vagina was tested without…”
Get full text

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…”
Get more information

Effects of estrogen and progesterone on serum prolactin and luteinizing hormone levels in ovariectomized turkeys (Meleagris gallopavo) by El Halawani, M E, Silsby, J L, Fehrer, S C, Behnke, E J

“…Serum prolactin (PRL) and luteinizing hormone (LH) levels from mature female turkeys were determined following ovariectomy and daily subcutaneous injections…”
Get more information

Multiple Forms of GnRH Are Released from Perifused Medial Basal Hypothalamic/Preoptic Area (MBH/POA) Explants in Birds by Millam, J.R., Ottinger, M.A., Craig-Veit, C.B., Fan, Y., Chaiseha, Y., El Halawani, M.E.

“…Both chicken gonadotropin-releasing hormones I and II (cGnRH I and II) were detected in abundant quantity by radioimmunoassay of extracts of Japanese quail…”
Get full text

Release of gonadotropin-releasing hormone from the Japanese quail hypothalamus in vitro by Millam, J R, Burke, W H, El Halawani, M E

“…The regulation of GnRH (gonadotropin-releasing hormone) secretion in Japanese quail was studied by maintaining excised hypothalamic slices containing the…”
Get more information

Vasoactive intestinal peptide is a hypothalamic prolactin-releasing neuropeptide in the turkey (Meleagris gallopavo) by el Halawani, M E, Silsby, J L, Mauro, L J

“…The hypothesis that vasoactive intestinal peptide (VIP) functions as a hypothalamic prolactin (PRL)-releasing peptide in the turkey was tested by determining…”
Get more information

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…”
Get full text

Ovarian involvement in the suppression of luteinizing hormone in the incubating turkey (Meleagris gallopavo) by el Halawani, M E, Silsby, J L, Foster, L K, Rozenboim, I, Foster, D N

“…A series of experiments were conducted to elucidate the role of the ovary in incubation behavior-associated luteinizing hormone (LH) suppression. Ovariectomy…”
Get more information

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…”
Get more information

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…”
Get more information

Pineal and ocular influences on male and female turkeys: plasma luteinizing hormone and prolactin levels during gonadal development by Siopes, T D, el Halawani, M E

“…Plasma levels of prolactin (PRL) and luteinizing hormone (LH) were determined in pinealectomized (PX) and/or bilateral ocular enucleated (EX) turkey hens and…”
Get more information

Modulation of the prolactin response to thyrotropin releasing hormone by ovarian steroids in ovariectomized turkeys (Meleagris gallopavo) by Saeed, W, el Halawani, M E

“…The effect of thyrotropin releasing hormone (TRH) administered intramuscularly (im) on serum levels of prolactin (Prl) in ovariectomized (ovx) adult turkeys…”
Get more information

Basal and hypothalamic extract-induced luteinizing hormone and prolactin secretion by cultured anterior pituitary cells from female turkeys in various stages of the reproductive cycle by el Halawani, M E, Silsby, J L, Fehrer, S C

“…The wet weight of the anterior pituitary gland of the domestic turkey increases as the hen progresses through the reproductive cycle. The greatest wet weight…”
Get more information