1. Institute of Tropical Agriculture and Food Security, Serdang, Selangor, Malaysia
2. Department of Animal Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
3. Novozymes Malaysia SdnBhd, Kuala Lumpur, Malaysia
4. Department of Poultry Production, University of Khartoum, Khartoum North, Sudan