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
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TLDR
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.Abstract:
The present study was designed to examine the role of circadian organization in the control of seasonality in the seasonally breeding spotted munia, Lonchura punctulata, which does not utilize photoperiod to time its reproduction under natural day-length conditions.
Daily injections of L-dihydroxyphenylalanine (L-DOPA, precursor of dopamine) given 12 hr and 8 hr after administration of 5-hydroxytryptophan (5-HTP, precursor of serotonin) alter the gonadal and body-weight responses of the spotted munia, when it is maintained under short-day conditions (LD 6:18). The 12-hr interval was stimulatory and the 8-hr interval was inhibitory for both gonadal and body-weight responses while other intervals (0, 4, and 16 hr) had no effect. A 20-hr interval was stimulatory only for gonadal growth and had no effect on body weight.
These findings support the suggestion that the endogenous seasonal mechanism is determined by circadian organization (i.e., by changes in the phase relationships of two neural oscillations and their many other circadian expressions). The results also 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. Furthermore, the mechanism of regulation of seasonality seems to be similar in species that do and do not utilize day length as the primary regulator with which to time their seasonal reproductive and metabolic cycles.read more
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Journal ArticleDOI
Four Hour Temporal Relation of 5-HTP and L-DOPA Induces Inhibitory Responses in Recrudescing Gonad of Indian Palm Squirrel (Funambulus pennantii).
TL;DR: It is apparent that seasonal testicular recrudescence of Indian palm squirrel during short day length by 4 h relation of 5-HTP and L-DOPA is not a pharmacological effect but actually is an alteration of seasonality in this annually breeding mammal.
Journal ArticleDOI
Mucuna pruriens seed powder feeding influences reproductive conditions and development in Japanese quail Coturnix coturnix japonica.
TL;DR: Results suggest that M. pruriens is a rich natural source of l-DOPA and the development and reproduction in Japanese quail might be associated with the dopaminergic system of the brain.
Journal ArticleDOI
Temporal Phase Relation of Serotonergic and Dopaminergic Oscillations Alters Seasonal Reproduction and Adrenal Function in Jungle Bush Quail and Rain Quail~!2009-01-06~!2009-02-02~!2009-04-09~!
TL;DR: It is concluded that specific relation of serotonergic and dopaminergic oscillation induces reproductively quiescent or active condition out of the season as a function of their time relation and suggests that, circadian organization may regulate reproductive and metabolic seasonality irrespective of the phase of the annual gonadal cycle.
Journal Article
Temporal Phase Relation of Serotonergic and Dopaminergic OscillationsAlters Seasonal Reproduction and Adrenal Function in Jungle Bush Quailand Rain Quail
TL;DR: It is concluded that specific relation of serotonergic and dopaminergic oscillation induces reproductively quiescent or active condition out of the season as a function of their time relation and suggests that, circadian organization may regulate reproductive and metabolic seasonality irrespective of the phase of the annual gonadal cycle.
References
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Book
Computational Handbook of Statistics
James L. Bruning,B. L. Kintz +1 more
TL;DR: In this paper, the authors present an analysis of correlation and correlation coefficients for the Mann-Whitney Test, the Newman-Keuls' and Tukey Mulitple-Comparison Tests, and the Signed-Pairs, Signed-Ranks Test.
Journal ArticleDOI
Photorefractoriness in birds and comparison with mammals
Journal ArticleDOI
Light and other environmental factors affecting avian reproduction.
Donald S. Farner,B. K. Follett +1 more
Journal ArticleDOI
Circadian rhythmicity in photoperiodically induced gonadotrophin release and gonadal growth in the quail.
B. K. Follett,P. J. Sharp +1 more
TL;DR: There is now good evidence available to support Bünning's hypothesis in plants, and in at least four species of finches where the photoperiodic induction of testicular growth also relies on a circadian rhythm.
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