The aim of this research was to study the effect adding of phytase in broiler’s feed to its performance. This research was held for 7 weeks (May - June) in Laboratory Cages of Animal Nutrition and Feed Departement, Agriculture Faculty, University of Sriwijaya. A Completely randomized design with 6 treatment and 3 replication were used as follow ; P0 (basal ralion 100%), Pl(basal ration 100% +…