N T Long, T T B Ngoc and L T H Thao 2012 Influence of phytase supplementation to rice bran - based diets on the digestibility and phosphorus excretion in growing pigs. 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/long.nias.htm