Histomorphological Changes in the Thyroid Gland of Guinea Fowl (Numida meleagris) Exposed to Different Photoperiod Regimens and Exogenous Melatonin. Sahel Journal of Veterinary Sciences, [S. l.], v. 22, n. 4, p. 11–16, 2026. DOI: 10.54058/1yx15r28. Disponível em: http://www.saheljvs.org/index.php/saheljvs/article/view/557.. Acesso em: 9 feb. 2026.