I don't think it is all that hard to track "colonies in production" versus
colonies that have little chance of pulling more than their own weight, such
as spring splits.

In apple growing, one has "acres in cultivation" and "acres in production",
and like beehives, there is a lag between establishment of a tree and the
ability to harvest from it.  Almonds have the same situation.   I doubt that
growers figure in trees or acres "in cultivation" when they do their yield
calculations. 

"Yield per hive" should not include hives that aren't yielding!  

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