The present study was conducted in the privet apiary established at Kafr Saad distances, Damietta Governorate, North Egypt, during summer season of 2019, (July and August). The experiments were carried out to determined the effect of genetic origin of the grafted larvae, (Apis mellifera carnica and Apis mellifera bukfast) and level of bar at which the queen cells hung within rearing frame, (top, medium and bottom levels) and the position of these cells on the rearing bar (middle and peripheral positions) on some output parameters concerned in commercial queens production. The genetic origin of larvae used in grafting process has a positive and significant effect on their acceptance percentage and the live weight of the produced queens when nursed by related starter and finisher building colonies. The percentages of acceptance, sealing and queen emergence as well as the weight of newly emerged virgin queens slightly influenced by the level and position at which the cells presented. In general, queen cells on the bottom bar and middle position were attained a little performance than the others in the commercial queen production during summer season of North Egypt.
The present studies were carried out to investigate the quantity (as % of accepted larvae, sealed queen cells and emerged queens) and quality (as weight of queen at emergence) of queen honeybees as affected by some internal environmental factors related to rearing process during late winter period and summer season of two successive years, (2018/2019) at Damietta governorate, (North Egypt). No significant difference was found for all parameters between the two studied years. Significant increase in the percentages of acceptance, sealed queen cells and emerged queens as well as weight of queens at emergence were obtained when introducing 32 than 48 larval queen cells into starter and finisher queen rearing colony, respectively. Larval queen cells which presented on the middle position, (174.6 mg./queen) of rearing bar produced more frequently queens with heavy weight than those presented on the peripheral ones, (169.9mg./queen). The artificially reared virgin queens during summer season were significantly heavier (175.7 mg. /queen) than those reared during the period of late winter, (166.9 mg./queen).
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