OVWIGHO, B.O.; BRATTE, L.; ISIKWENU, J.O. Chicken Management Systems and Egg Production in Delta State Nigeria```````````````````. International Journal of Poultry Science, Pakistan, v. 8, n. 1, p. 21–24, 2008. DOI: 10.3923/ijps.2009.21.24. Disponível em: https://ijpsjournal.org/index.php/ijps/article/view/1118. Acesso em: 21 sep. 2025.