1. Laboratory of Nutrition; Department of Animal Production; Faculty of Veterinary; University of Liege; Liege Belgium
2. Department of Animal Production; Faculty of Agriculture; University Abdou Moumouni; Niamey Niger
3. Laboratory of Reproductive Physiology; Department of Science Functional; Faculty of Veterinary; University of Liege; Liege Belgium
4. Department of Biology; Faculty of Science and Technology; University Abdou Moumouni; Niamey Niger