1. Poultry Production Department, Kafrelsheikh University, Kafr El-Sheikh, Egypt;
2. Department of Animal Nutrition, Slovak University of Agriculture, Nitra, Slovak Republic;
3. Department of Poultry Science and Small Animal Husbandry, Slovak University of Agriculture, Nitra, Slovak Republic;
4. Department of Animal Physiology, Slovak University of Agriculture, Nitra, Slovak Republic;
5. Department of Animal Production, King Saud University, Riyadh, Saudi Arabia