From the video: Practical Beekeeping Part 4
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During the second and at the beginning of the third period, all the way until the start of the main honey flow, mating nucs for queen rearing are set up.
The Roshus bottom board is placed on the inner cover, on which the feeder hole has been previously screened — so that heat goes into all three compartments in the dedicated super. Each compartment can receive a small mating nuc, allowing up to three queens to be produced simultaneously with a single bottom board.
Queen rearing is essential for any serious apiary — it enables regular replacement of old queens and maintaining quality genetic material in all colonies.