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Influence of photoperiod and exogenous melatonin on testis morpho-physiology of sexually mature guinea fowl (Numida meleagris).
- Source :
-
Animal Reproduction Science . Apr2024, Vol. 263, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- The biological effects of simulated photoperiod and melatonin on the control of reproduction of guinea fowls (Numida meleagris) are not well understood. Herein, thirty (30) sexually mature guinea fowl cocks were randomly assigned to 1–6 groups (n = 5) and subjected to different photoperiodic regimes in the presence or absence of exogenous melatonin (Mel; 1 mg/kgBW/day, i/m) for eight weeks. Testes of the euthanized cocks were processed for gross morphology, histological, histochemical, and oxidative stress markers. Testosterone concentration was determined in serum samples using the enzyme-linked immunosorbent assay (ELISA) technique. We observed an increase in testicular size in the Mel and Non-Mel groups under long-day (LD) photoperiods, and in the Non-Mel group under short-day (SD) photoperiod. Conversely, the testicular size was drastically reduced in the Mel group for SD. Seminiferous tubules in the Mel and Non-Mel groups of the SD showed cytomorphological changes, including degenerated cells, focal vacuolations, and depletion of germinal epithelium. However, the germinal epithelium appeared to be complete and active in both the Mel and Non-Mel groups for the LD. In all groups, the testes showed positive staining for PAS with varying intensities. There was a significant difference in PAS-staining intensity between different photoperiodic regimes and exogenous melatonin. The study observed the interaction between photoperiods and exogenous melatonin on glutathione reductase (GSH), malondialdehyde (MDA), and serum testosterone. Overall, the results indicated that a long-day (LD) photoperiod, combined with exogenous melatonin, enhanced reproductive activity in male guinea fowl by increasing testicular size and serum testosterone concentration. [Display omitted] • Testicular size and serum testosterone concentration decreased in male guinea fowl exposed to short-day (8 L:16D) photoperiod and exogenous melatonin • Enhanced reproductive performance was observed in male guinea fowl exposed to long-day (16 L:8D) photoperiod and exogenous melatonin. • Increased levels of testicular malondialdehyde (MDA) were observed following exposure to a short-day (8 L:16D) photoperiod and exogenous melatonin. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03784320
- Volume :
- 263
- Database :
- Academic Search Index
- Journal :
- Animal Reproduction Science
- Publication Type :
- Academic Journal
- Accession number :
- 176247519
- Full Text :
- https://doi.org/10.1016/j.anireprosci.2024.107410