Isika, M.; Agiang, E.; Eneji, C. Complementary Effect of Processed Broiler Offal and Feather Meals on Nutrient Retention, Carcass and Organ Mass of Broiler Chickens. Int. J. Poult. Sci. 2006, 5 (7), 656–661. https://doi.org/10.3923/ijps.2006.656.661.