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In this study, the activity of invertase, glucose oxidase and diastase enzymes in hypopharengeal gland were determined for Egyptian and Carniolan honeybees. Three colonies were chosen randomly from the population of each race for assaying the enzymes activity on three ages of worker bees: Newly emerged, 10-15 day old and foragers. The results show that the hypopharengeal gland expressed the three enzymes in different quantities in the three ages except invertase which could not be detected in newly emereged bees of Carniolan race. Generally, diastase is significantly more secreted than invertase and glucose oxidase, and the secretion of newly emerged bees is significantly less pronounced than in nurse and foraging age. The significant differences between the two races were obviously expressed in foragers for invertase and diastase enzyme, and in nurse bees for glucose oxidase in favor of Carniolan race, whereas the difference was significantly higher in newly emerged bees for Diastase and invertase in Egyptian bees. This result establishes different views of the secretion trend of the three enzymes in the two honeybee races, which may considered as racespecific characteristic.

Activity of hypopharengeal gland in secreting honey-elaborating enzymes in Carniolan and Egyptian honeybees