Nguyen Nhut Xuan Dung, Le Thanh Phuong, Ngo Minh Suong and Luu Huu Manh 2012 Effect of crude rice bran oil supplementation on performance, egg production and quality, plasma lipid and yolk cholesterol of laying hens; Proceedings of the International Conference "Livestock-Based Farming Systems, Renewable  Resources and the Environment", 6-9 June 2012, Dalat, Vietnam (Editors: Reg Preston and Sisomphone Southavong) http:/www.mekarn.org/workshops/dalat2012/html/xdungctu2.htm