Yvette Miller, Kim Nairn, and Kate Gannon Murdoch University Portec Veterinary Services Pigs Lecture 1 ANS 101 / VET 242 2012.
Dr. Györgyi Molnár – Péter Földi Hungarian Poultry Product Board 1.
Animal Nutrition Mc Donald, Greehalgh and Warner. 1987. Animal Nutrition. Longman
2012 Jiva April Page 17-23
Farm & Industry Trader, December 2014
