Nguyen Thi Thuy 2012 Effects of inclusion of catfish (Pangasius hypophthalmus) by-product meal and probiotics on performance, carcass quality and ileal and total amino acid digestibility in chickens.  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/thuy.ctu.htm