Why Mated Queens Look Small in Cages
When introducing a new mated queen to a colony, it is common to unbox her and find a bee that looks surprisingly like an unmated virgin. Her abdomen is small, and she lacks the long, trailing profile of a fully active laying queen. This temporary shrinkage is a natural physiological response to being caged and prepared for transport. Here is what causes the size difference:
- Ovary Regression A fully laying queen produces upwards of 1,500 to 2,000 eggs a day. To sustain this, her ovaries are heavily engorged, which swells her abdomen (a state called physogastry). When she is removed from the comb and placed in a shipping cage or a queen bank, she has nowhere to lay. Her reproductive system responds by rapidly halting egg production. Without active egg development, her ovaries shrink drastically, reducing her overall abdominal volume.
- Diet Modification by Attendants In a functioning hive, nurse bees constantly feed the queen a rich diet of royal jelly to fuel her egg production. In a shipping cage, her few attendant bees alter her diet. This reduction in rich food mimics the natural slimming process that workers use to prepare a heavy, laying queen for flight during a swarm.
The Rebound
A small abdomen in a caged, mated queen is not a sign of poor breeding or a failed mating flight. Once she is successfully introduced to the colony, accepted by the workers, and fed royal jelly again, her ovaries will reactivate. Within three to four days of resuming her laying pattern, her abdomen will expand back to its full size.
