Nguyen Thi Hong Nhan ,Vo Van Son , Preston T R and Leng R A  2005: Effect of an oil drench on the growth rate of cattle fed diets of low or high digestibility; Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #09. Retrieved, from http://www.mekarn.org/proctu/nhan09.htm