Suchitra Kanpukdee 2005: Effects of a rumen supplement (urea, phosphorus and sulphur) on feed intake of cattle and buffaloes given basal diets of mulato grass (Brachiaria hibrido.co) or rice straw. MEKARN Mini-projects, September 2005.  Article # 18. Retrieved, from http://www.mekarn.org/MSC2005-07/protocols/such18.htm