الفهرس 
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Abstract
Objectives : The goal of this study was to investigate the possible effect of thyroxine hormone, different queenless workers population in rearing colonies, bar level within grafted frame and different queen cups position within grafted frame on queen rearing. Methods and Results : The current study was carried out in a private apiary at Meet Salseel, Manzala region, Dakahlia province, Egypt, during the period from the 16 February to 14 May, 2016 and 3 February to 17 April, 2018. The treatments were applied on three rearing colonies in the first part of experiment, and in the second experiment six rearing colonies were used from Carniolan bees (Apis mellifera carnica). The obtained results clarify that: no effect of the Thyroxine hormone on the emerged queen weight within three different sequenced days. However, the thyroxine different dose influence on emerged queen ovarioles number at experimental. The multiplied dose of thyroxine hormone influence on emerged queen ovarioles number. However, no effect on the emerged queen weight. The different queenless worker populations: There were clear significant differences in the acceptance percentage of grafted queen cups and the emergence percentage of virgin queens between the lower and higher worker populations of the tested colonies. However, There were no significant differences in the weight of virgin queens and the length. The bar level within grafted frame: There were significant influences in the acceptance percentage of grafted queen cups on the top bar level due to the minimum temperature. There were no significant differences in the acceptance percentage of grafted larvae, the emergence percentage of virgin queens (mg), the length of queen cells (cm), the weight of virgin queens and between the different bar level within grafted frame in the rearing colonies. The different queen cups position: There were significant differences in the acceptance percentage of grafted larvae, the emergence percentage of virgin queens, the weight of virgin queens and the length of queen cells between the different queen cups position within grafted frame of the rearing colonies. However, no significant effect on the acceptance percentage of grafted larvae for the interaction between cell position and minimum, maximum and mean temperatures.