Sengsouly P, Visam V, Sangkhom I and Preston T R 2012: Effect on growth performance of ducks of supplementing a basal diet of rice bran with water spinach, duckweed or ensiled taro leaves. 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/seng24053.htm