1. Department of Animal Sciences Faculty of Sciences University of Douala Douala Cameroon
2. Department of Veterinary Preclinical Sciences Faculty of Veterinary Medicine Universiti Putra Malaysia Serdang Malaysia
3. Department of Poultry Production Faculty of Animal Production University of Khartoum Khartoum Sudan
4. Department of Clinical Sciences Faculty of Veterinary Medicine University of Kufa Kufa Iraq