“The Effect of Supplementation Urea and Sulfur in Mixed Cassava Waste Fermented and Soyabean Cake Waste on Digestibility of Protein and Blood Urea Male Sheep”. Animal Production: Indonesian Journal of Animal Production 1, no. 2 (May 2, 2011). Accessed October 29, 2026. https://jap.fapet.unsoed.ac.id/index.php/JAP/article/view/1019.