Poulsen, H D, Blaabjerg, K, Strathe, A, Ader, P & Feuerstein, D 2009, ' Evaluation of different microbial phytases on phosphorus digestibility in pigs fed a barley and wheat based diet ', 11th Symposium on Digestive Physiology in Pigs, Spain, 19/05/2009-22/05/2009 . Poulsen, H D, Blaabjerg, K, Strathe, A, Ader, P & Feuerstein, D 2009, ' Evaluation of different microbial phytases on phosphorus digestibility in pigs fed a barley and wheat based diet ', 11th International Symposium on Digestive Physiology in Pigs, Spain, 19/05/2009-22/05/2009 .