>The four frame units seemed invigorated and would romp away.

They sure do!
I've spent this week putting together a truckload of nucs for sale, and have
had plenty of time to look at them growing (I sell the nucs that the queen
is mated in, as opposed to making them up with caged queens).

Once our queens are mated and laying, we make sure that they have 5 frames
of bees.  The new queens will then very quickly fill four or more of those
frames with brood, provided that there is not too strong a nectar flow.

Three weeks later, when that brood begins to emerge, the colonies simply
explode!

Randy Oliver

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