الفهرس 
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Abstract
This study was carried out at the poultry Research station, EL-Kanater EL-Khairia, Kalubia governorate belonging to Animal Production Research Institute, ARC., Egypt. This study included
600 broiler chicks one day old and used till-7 weeks. Chicks
were divided into three experiments, each experiment was divided into five treatments. Broiler chickens of all treatments were fed diets was fed ration of plant origin. In experiment (1): the diet composition depend on soybean meal as source of plant protein. experiment (2): the main source of plant protein was sesame meal. experiment (3): sunflower meal was the main source of plant protein. In each experiment, the treatments were: the control balanced diet, the low P diet and the low P diet with
250, 500 and 750 unit of phytase/kg. Results obtained indicated that phytase supplementation showed improvement in productive performance of broiler including average body weight, average body weight gain, feed intake and feed conversion. Moreover, phytase addition improved utilization of P, Ca, Cu and Zn, improved bone quality whatever was the source of protein.