1. Regional Center of Excellence on Poultry Sciences, University of Lome, Lome, Togo
2. Faculty of Agricultural Sciences, University of Abomey-Calavi, Cotonou, Benin
3. Laboratory of Endocrinology and Biology of Animal Reproduction, Felix Houphouët Boigny University, Abidjan, Côte d’Ivoire
4. Department of Animal Physiology, Federal University of Agriculture, Abeokuta, Nigeria