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Showing 1 to 14 of 14 for “"Gonadal steroids"”.
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The Effect of Gonadal Steroids and Altered Tryptophan Metabolism on behaviour
Gonedal steroids have been shown to affect tryptophan metabolism in both brain and body, end are thus thought capable of altering the rate of 5-hydroxyptamine synthesis, end consequently, serotoninergic neuronal activity. Subsequent behavioural changes should result, and a primary aim of the …
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Temporal profile of gonadal steroids in populations of roosters divergently selected for mating frequency
This research was conducted to establish a temporal hormone profile in genetically selected populations of roosters differing in sexual activity. Plasma levels of androstenedione (AE), dihydrotestosterone (DHT), testosterone (T), total androgens (Total A) and estradiol-17<sub>β</sub> (E₂) were …
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Annual Cycle of Serum Gonadal Steroids and Serum Lipids Associated With Migration of the Striped Mullet, <em>Mugil cephalus</em> L.
… the fall schooling and migratory periods.Serum gonadal steroids increased 8-10 fold from late September to the end of November for both sexes. The gonadal mass and Gonado-Somatic Index of Mugil cephalus rose rapidly in October and November returning to prespawning values in December. …
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Bone morphogenetic proteins (BMPs): new modulators of the follicle stimulating hormone (FSH) synthesis and release
… gonadotropin releasing hormone (GnRH) and gonadal steroids (progesterone and oestradiol). Despite these common regulators, divergences in the circulating patterns of LH and FSH are often encountered. Such divergences have suggested that other factors are specifically implicated in the …
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Photoperiod, Brain Plasticity, and Behavior
… 2. Downstream of pineal melatonin signaling, gonadal steroids are also altered in short days in this species, and the role of gonadal steroids in photoperiod-mediated changes in the hippocampus is explored in Chapter 4. Given that the hippocampus is heavily interconnected with other brain …
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Hormone analyses of Black-Footed Albatross (Phoebastria Nigripes) at Midway Atoll NWR and Tern Island, Hawaiian Islands NWR
… 1996; Auman et aI., 1997). Thus, the levels of gonadal steroids may function as indicators of exposure to polycWorinated biphenyls in the soil affecting these long-lived seabirds. The objective of this study was to determine if nesting in PCB-contaminated areas affects hormone balance due to …
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Melatonin and seasonal cycles in muskoxen
… measure serum concentrations of gonadotrophins, gonadal steroids, prolactin and melatonin. Informal observations of dominance and breeding behaviour of males were recorded, semen was collected and assessed for gross motility, sperm concentration and abnormalities, and dimensions of male accessory …
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The control of prolactin secretion and the role of gonadotrophin releasing hormone in the production of concordant secretory spikes of luteinizing hormone and prolactin in the luteal phase of the menstrual cycle
… neurotransmitters higher up in the hypothalamus. Gonadal steroids may also modulate the effect of peptides or dopamine at the level of the lactotrope. Prolactin's major role in the female rat is one of milk production post - partum, nurturing the young. It probably also has other physiological …
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Hormonal mechanisms for variation in female mate choice
… flexibility in mate choice behavior, changes in gonadal hormones and hormonal modulation of sensory systems involved in mate choice behavior. Flexibility in mate choice was examined in female túngara frogs (Physalaemus pustulosus), a Neotropical species in which mate choice has been well studied. …
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Effects of Electrical Stimulation and Testosterone in Translational Models of Peripheral Nerve Injury
… effects of electrical stimulation (ES) and gonadal steroids have been demonstrated independently and in combination in extratemporal and intratemporal facial nerve injuries. The goals of the first aim were to develop a reliable intracranial facial nerve crush model and to investigate the …
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Neonatal exposure to estradiol in female rats influences neuroactive steroid concentrations and behaviour in the adult rat
The gonadal steroids, in particular estradiol, exert an important action during perinatal period in the regulation of sexual dimorphism and neuronal plasticity, and in the growth and development of nervous system. Exposure of the developing female to estrogens during perinatal period may have …
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The activity and functioning of the hypothalamic-pituitary-adrenal axis of the red deer stag (cervus elaphus)
… April than at other times of year. The role of gonadal steroids in modulating the seasonal rhythm of HPA axis activity and function in the red deer stag was investigated. Basal secretion of cortisol and responses to administration of ACTH₁₋₂₄ (0.04 IU kg⁻¹ live weight), CRH (25 ng kg⁻¹ live …
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The role of progesterone receptor in hypothalamic kisspeptin neurons
… express steroid hormone receptors through which gonadal steroids exert both positive and negative feedback to the hypothalamus; estrogen and its receptor, estrogen receptor α (ERα), have been shown to regulate kisspeptin-mediated GnRH release through regulation of kisspeptin expression. However, …