Wongsuthavas, S. et al. 2007. Energy Expenditure by Broiler Chickens Fed Diets Containing Various Blends of Beef Tallow and Soybean Oil. International Journal of Poultry Science. 6, 11 (Oct. 2007), 796–799. DOI:https://doi.org/10.3923/ijps.2007.796.799.