Nguyen Thi Hong Nhan, Nguyen Trong Ngu, Preston T R  and Leng R A 2008 Effects of drenching soybean oil and fish oil on intake, digestibility and growth of cattle in the Mekong Delta, Vietnam. 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/nhan.htm