Effect of melatonin on gonads, body weight, and luteinizing hormone (LH) dependent coloration of the Indian finch, Lal munia (Estrilda amandava)
| Autor: | C. Haldar-Misra, M. Ghosh, Braj Bansh Prasad Gupta, J.P. Thapliyal |
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| Rok vydání: | 1987 |
| Předmět: |
Male
endocrine system medicine.medical_specialty Thyroid Gland Testicle Birds Melatonin Endocrinology Internal medicine Testis medicine Animals biology Pigmentation Body Weight Thyroid Organ Size Luteinizing Hormone biology.organism_classification medicine.anatomical_structure Plumage Feather visual_art Amandava visual_art.visual_art_medium Animal Science and Zoology Seasons Luteinizing hormone hormones hormone substitutes and hormone antagonists medicine.drug Hormone |
| Zdroj: | General and Comparative Endocrinology. 65:451-456 |
| ISSN: | 0016-6480 |
| DOI: | 10.1016/0016-6480(87)90131-6 |
| Popis: | Four doses of melatonin were administered intramuscularly over 30 days in separate groups of intact adult male Lal munia, Estrilda amandava, during mid-day (1300 hr) and mid-night (0100 hr) in separate sets during the month of August (late progressive phase), and their effects were studied on the body weight, gonadal and thyroidal activities, and luteinizing hormone (LH)-dependent plumage and beak pigmentation. Melatonin, irrespective of its dose and the time of administration, invariably induced complete inhibition of seasonal gonadal growth and activity, and also the LH-dependent plumage pigmentation. Melatonin had no effect on LH-dependent beak coloration. The inhibitory effect of melatonin on the body weight growth was found to be dependent on the time of administration and the dose of the hormone. Melatonin inhibited the thyroid activity in all the groups. These findings seem to suggest that while melatonin influences gonadal activity, body weight growth, and thyroid activity by acting directly at the hypothalamo-hypophyseal complex, it counteracts the effect of LH at the feather papillae level. Further, synthesis and/or release of FSH seems to be more sensitive to melatonin than that of LH. However, the metabolic action of melatonin might be species specific. |
| Databáze: | OpenAIRE |
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