الفهرس 
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Abstract
The present study was carried out at the poultry research center, poultry department, faculty of agriculture, alexandria university, over the period from september 2010 to january 2011. The objective of this study was to determine the effect of different phytase enzyme levels (0, 500 and 1000 FTU / kg diet) on reproductive performance of alexandria cocks at different periods of age.