الفهرس 
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Abstract
This study was undertaken in broiler chickens to evaluate possible effect of different levels of calcium and phosphorus, with or without supplementation of phytase on body performance, biochemical parameters, bone mineralization, and carcass traits.
A five week feeding study was carried out to assess the effects of phytase enzyme with different level of calcium and available phosphorus on Ross 308 broilers on performance, carcass traits and deposition of calcium and phosphorus on serum and tibia of broiler chickens. One hundred and sixty-eight one day-old Ross 308 broiler chicks were used. The birds were weighed and assigned to equal six treatment groups with fixed calcium to phosphorus ratio 2:1. Each two treatments have the same value of available phosphorus according feeding stage but one of them with supplementation of Hiphos GT (100gm/ton phytase enzyme unit FTU/Kg) and the other one without supplementation in a completely randomized design. Each treatment had four replicates and each replicate contains seven chicks. The results showed that phytase enzyme supplementation with available phosphorus 0.5% and 0.45% significantly elevated (P<0.05) body weight, body weight gain and feed intake, and reduced (P<0.05) feed conversion ratio in starter period. All parameters in grower, finisher period and overall showed non-significant for all groups. Moreover, the highest significant value from all other groups in liver enzymes Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) in serum, founded in broilers fed the diet with phytase enzyme and available phosphorus 0.40% and without phytase enzyme in creatinine. Calcium value with available phosphorus 0.35% with phytase enzyme showed high significance. In Phosphorus we found that usage of phytase enzyme with available phosphorus 0.30% and 0.35% as same as 0.35% without phytase. In weight, eviscerated and dressing usage of phytase enzyme with available phosphorus 0.4% revealed the highest significant difference from all groups. Thigh, breast and drumstick value showed non-significant difference from all other groups.