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The possibilities of use of microbial phytase in maize/soybean meal diets for  broilers from 21 to 42 days of age with different dietary total and available  phosphorus (TP and AP) levels were investigated. A 22-day experiment was  carried out on 240 Arbor Acres broilers of both sexes divided into six  groups. The broilers were given diets with 0.43%, 0.23% or 0.10% AP, with or  without phytase supplementation. During the experiment, health status and  mortality, physical, chemical and morphological bone characteristics were  investigated. Reduction of the mineral source of P from the diet increased  mortality and health problems. Addition of phytase decreased mortality and  alleviated negative effects of dicalcium phosphate exclusion. Histological,  physical and chemical analysis of broiler tibia indicates that the extent and  significance of changes depend on P deficiency and phytase addition. Phytase  efficacy was greater in diets with a reduced level of dicalcium phosphate

The effectiveness of phytase in broiler diets in improving production performances and bone features