1. Faculty of Bioresources and Food Industry, School of Animal Science, Universiti Sultan Zainal Abidin, Besut, Malaysia
2. Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia, Serdang, Malaysia
3. Department of Animal Science, Universiti Putra Malaysia, Serdang, Malaysia
4. Department of Poultry Production, University of Khartoum, Khartoum North, Sudan