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Details for article 2 of 6 found articles
| Title: |
Diurnal Profiles of Serum Triiodothyronine and Thyroxine Levels: A Study in Male Roseringed Parakeets (Psittacula krameri) Following Exogenous Administration of Melatonin |
| Author: |
Maitra, S. K. Roy, T. K. Mal, J. |
| Appeared in: |
Biological rhythm research |
| Paging: | Volume 27 (1996) nr. 4 pages 452-461 |
| Year: |
1996-11 |
| Contents: |
This study demonstrates that under subtropical environmental conditions the circulating levels of triiodothyronine (T 3 ) and thyroxine (T 4 ) in adult male roseringed parakeets undergo parallel changes according to a diurnal cycle with a trough in the early morning and a peak in the evening. Chronic afternoon administration of melatonin (25 µg/ 100 g body wt./ day for 30 consecutive days) abolishes time-bound changes in the concentrations of T 3 by suppressing its evening peak, but does not abolish the diurnal rhythm of T 4 . Exogenous melatonin, however, causes a significant increase in the evening value of serum T 4 and a decrease in its value at midnight resulting in phase-shifting of the diurnal fluctuations of T 4 compared to that in the control birds. It appears that exogenous melatonin can alter the diurnal profiles of serum thyroid hormones in a wild psittacine bird. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 2 of 6 found articles
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