Journal ArticleDOI
The effect of different temporal relationships of 5‐hydroxytryptophan (5‐HTP) and l‐dihydroxyphenylalanine (L‐DOPA) on reproductive and metabolic responses of migratory red‐headed bunting (Emberiza bruniceps)
TLDR
It is manifested that 12 hour relationship of these two neural oscillations may induce breeding conditions (summer), 8 hour relationship induced post reproductive regressive/photorefractory condition (late summer) and 4‐hour relationship induced...Abstract:
To study the reproductive and metabolic effects of circadian serotonergic and Dopaminergic activities, 5‐hydroxytryptophan (5‐HTP, serotonin precursor) and L‐dihydroxyphenylalanine (L‐DOPA, dopamine precursor) were administered daily in different temporal relationships in Red‐headed bunting (Emberiza bruniceps) during the preparatory phase of annual gonadal cycle. L‐DOPA given daily after 12 hours of 5‐HTP injection (12‐hr relationship) induced full gonadal development and fat deposition. But, L‐DOPA given after 4 hours of 5‐HTP administration (4‐hr relationship) stimulated only fat deposition without any gonadal effect. On the other hand, these two drugs injected 8‐hour apart led to significant decrease in gonadal growth as well as fat deposition. The findings manifested that 12 hour relationship of these two neural oscillations may induce breeding conditions (summer), 8 hour relationship induced post reproductive regressive/photorefractory condition (late summer) and 4‐hour relationship induced...read more
Citations
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Journal ArticleDOI
Timed daily injections of neurotransmitter precursors alter the gonad and body weights of spotted munia, Lonchura punctulata, maintained under short daily photoperiods
C. M. Chaturvedi,S. K. Prasad +1 more
TL;DR: The results indicate that interaction between these two systems does not produce any pharmacological effect but actually affects the seasonality of the birds, as indicated by the different gonadal and metabolic conditions that followed differently timed daily injections of drugs that influence serotonergic and dopaminergic activities.
Journal ArticleDOI
Temporal phase relation of circadian neural oscillations alters RFamide-related peptide-3 and testicular function in the mouse.
TL;DR: Findings not only suggest the modulation of gonadal development in mice by changing the temporal phase relation of serotonergic and dopaminergic oscillations, but also demonstrate an inverse correlation of RFRP-3 neurons and gonadal activity in both control and experimental conditions.
Journal ArticleDOI
Correlation of nitric oxide (NO) activity and gonadal function in Japanese quail, Coturnix coturnix japonica following temporal phase relation of serotonergic and dopaminergic oscillations
TL;DR: Activity of the reproductive system and NO activity waxes and wanes simultaneously in Japanese quail are concluded that reproductive effects may be induced via changes in NO activity, however the exact mechanism by which NO drives gonadal axis needs to be ascertained.
Journal ArticleDOI
Testicular atrophy and reproductive quiescence in photorefractory and scotosensitive quail: Involvement of hypothalamic deep brain photoreceptors and GnRH-GnIH system
TL;DR: The focus of study is to elucidate out the underlying molecular mechanism of modulation of the hypothalamic reproductive circuitry following the photoperception through the hypothalamus photoreceptor cells and the subsequent alteration in the reproductive responses in quail, kept under different simulated photoperiodic conditions.
Journal ArticleDOI
Apoptosis-mediated testicular alteration in Japanese quail (Coturnix coturnix japonica) in response to temporal phase relation of serotonergic and dopaminergic oscillations
TL;DR: It is concluded that specific phase relation of neural oscillations may modulate the local testicular GnRH-GnIH system and alter the apoptotic mechanism in quail testes, and the physiological effects of time-dependent drug delivery, including the specific time intervals between two drugs.
References
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Journal ArticleDOI
Flight Energy and Estimated Flight Ranges of Some Migratory Birds
Journal ArticleDOI
The effect of thyroidectomy on testicular size and on the photorefractory period in the starling (Sturnus vulgaris L.)
TL;DR: Thyroidectomy of Starlings prior to exposure to long photo-periods (17L:7D) resulted in a failure of testes to regress after an initial size increase, and thyroidectomy after four weeks of exposure resulted in testicular regression followed by a second period of size increase.
Journal ArticleDOI
Thyroidectomy prevents the development of photorefractoriness and the associated rise in plasma prolactin in starlings
TL;DR: It is confirmed that the presence of an intact thyroid gland is essential for the development of photorefractoriness and for the release of prolactin which normally follows photostimulation.
Journal ArticleDOI
The combined use of α-methyltyrosine and threo-dihydroxyphenylserine—selective reduction of dopamine levels in the central nervous system
TL;DR: dl - Threo -DOPS rapidly replenishes norepinephrine levels in reserpine-treated mice, but does not cause the awakening effect shown by l -DOPA under the same conditions.
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