الفهرس 
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Abstract
The present investigation was carried out during the two successive years from 20/3/1999 to 21/3/2001. Experiments were carried out during two seasons in the apiary belonging to Agriculture Research Center, Mansoura University to evaluation of several pollen substitutes for feeding honeybee colonies located in apiary, Faculty of Agriculture, Mansoura University. It aims to throw the light on some physiological and biological aspects of honeybee colonies fed on different diets as compared with control colonies.