Vo Thi Kim Thanh, E R Ørskov, Nguyen Thi Thanh and P Susmel 2008 The physiological mechanism of low purine derivative excretion in urine of buffaloes. Proceedings MEKARN Regional Conference 2007: Matching Livestock Systems with Available Resources (Editors: Reg Preston and Brian Ogle), Halong Bay, Vietnam, 25-28 November 2007 http://www.mekarn.org/prohan/thanh.htm