Leng R A and Preston T R 2005 Implications for livestock production of the decline in world oil reserves;  Workshop-seminar "Making better  use of local feed resources" (Editors: Reg Preston and Brian Ogle) MEKARN-CTU, Cantho, 23-25 May, 2005. Article #2. Retrieved, from http://www.mekarn.org/proctu/leng.htm