Summary
A single melatonin injection was administered intraperitoneally to three avian species in two doses (250 and 500 μg · 100 g body wt−1). Norepinephrine (NE), epinephrine (E), and corticosterone (C) contents of the adrenal gland were measured spectrofluorometrically 0.5, 2, and 24 h after injection. The results showed that melatonin at the lower dose caused a decrease of NE content in bulbul (42%), babbler (52%), and pigeon (39%), while at the higher dose it resulted in a decrease of NE only in bulbul (51%) 0.5 h after treatment. Melatonin at the lower dose also caused a decrease of NE in bulbul (45%) and babbler (53%) 2 and 24 h, respectively, after treatment, while at the higher dose it resulted in an increase of NE in bulbul (82%) and a decrease of NE in babbler (44%) 24 h after injection.
Both low and high doses of melatonin resulted in a decrease of E content in bulbul (32–43%), babbler (34–43%), and pigeon (44–56%) 0.5 h after treatment, and a 34–46% decrease of E in bulbul and a 32–33% decrease of E in babbler 2 h after treatment. A 57% decrease of E was evident in pigeon with the lower dose of melatonin 2 h after injection. Melatonin at the higher dose caused a 67% increase of E in babbler and a 41% decrease of E in pigeon 24 h after administration. Melatonin at the lower dose resulted in an increase of C content in bulbul (70%), babbler (132%), and pigeon (69%) 0.5 h after treatment. A 60% increase of C was evident in pigeon following the lower dose of melatonin 24 h after injection. Melatonin at the higher dose resulted in an increase of C in the bulbul of 72% and 86% at 0.5 and 24 h, respectively, after treatment. The results indicate that melatonin produces significant changes of NE, E, and C contents in three avian species. The lower dose appears to be more effective in changing NE and C content.
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Abbreviations
- C :
-
corticosterone
- CA :
-
catecholamine
- DBH :
-
dopamine β-hydroxylase
- E :
-
epinephrine
- NE :
-
norepinephrine
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Mahata, S.K., De, K. Effect of melatonin on norepinephrine, epinephrine, and corticosterone contents in the adrenal gland of three avian species. J Comp Physiol B 161, 81–84 (1991). https://doi.org/10.1007/BF00258750
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DOI: https://doi.org/10.1007/BF00258750