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Three Ca-P deficient diets viz., Diet-1 (0.85%, 0.35%), Diet-2 (0.75%, 0.30%) and Diet-3 (0.65%, 0.25%) were prepared and supplemented with either bacterial or fungal origin phytase enzymes and were compared with a control diet (1.0% and 0.45%). A total of 280 broiler (Ross 308) chicks were randomly allocated into 7 treatments having 4 replicates of 10 chicks using a completely randomized design. The effect of bacterial phytase on the growth, FCR and carcass weight was significantly ( P  &lt; 0.05) higher in chicks on Diet-1 compared to diet-3 (28 days). Bacterial phytase increased serum minerals (Ca and P) and tibia ash in diet-1 compared to Diet-3. Tibia Ca was significantly ( P  &lt; 0.05) higher in the control and the three diets under bacterial phytase compared to other treatments. On Diet-3, more Ca and P were reflected in tibial by bacterial phytase but did not support the optimum growth performance of broiler chicks. In conclusion, the same phytase but of different origins might have specific individual effects on the growth performance, serum and tibia Ca and P in broilers.

journal of applied animal research

Bacterial or fungal origin phytase enzyme affects the performance and mineralization of calcium and phosphorus differently in broiler chickens fed deficient calcium and phosphorous diets