An experiment was carried out to study the effects of phytase on the performance and calcium (Ca) and phosphorus (P) metabolism of AA broilers by supplementing phytase in low P diets. The basal diet (A) contained 0.41% of available P and diets B, C and D contained 0.26, 0.34 and 0.34, respectively. Phytase (U/kg) was s ...