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| Titel: |
Suppression of nocturnal increases in levels of melatonin elicits an anticipatory behavior in male quail |
| Auteur: |
Ohta, Mitsuaki Konishi, Hidehiko |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 23 (1992) nr. 1 pagina's 34-46 |
| Jaar: |
1992-02 |
| Inhoud: |
During the reproductive development of male Japanese quail the duration of daily activity is prolonged and the onset of the rhythm of activity is advanced relative to the light-dark cycle. The neuroendocrine basis for these changes was investigated with focusing on plasma levels of melatonin and testosterone. By means of 4 additional hours of photic stimulation of the brain, after the environmental lights (8L: 16D, lights on at 1000 hr) were turned off, the increase in levels of melatonin after lights-off was suppressed for a few days. Thereafter the early onset of daily locomotor activity was observed and the gonads began to develop. Similar behavioral changes occurred in castrated quail following direct brain-illumination or testosterone implants. The testosterone implants also suppressed the increases in levels of melatonin after lights-off, for a few days. Treatment with an antiserum raised against melatonin (anti-M) for the first 3 days, to suppress the increases in levels of melatonin after lights-off, elicited such an anticipatory behavior. These results suggest that suppression of the nocturnal rise in melatonin levels is important for the first steps toward reproductive activity in male Japanese quail. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 9 gevonden artikelen
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