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The correct link is
http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/19777/pnw623.pdf
Since bees live 6 weeks and spend the first 3 weeks inside the hive I
would say that 50% are foragers. But I am afraid that is not what you
are asking because it does not depend on the temperature.
"The Grade A Field colony must have
24,000 adults. According to Washington’s standard,
there should be six frames, with two-thirds of each
frame covered with bees at a temperature of 65°F.
This does not reflect all the bees in the colony, as
about one-third of adults would be out foraging
at that temperature. Therefore, the total number
Figure 5. Top view of a standard deep hive with 10 frames and bees.
There are approximately 24,000 bees in this picture.
of adults in a minimum standard colony would
approximately cover six frames fully (approximately
14,400 bees)."
This says that 1/3 of the adult bees (or 2/3 of the foragers) are away
from home, so if you inspect the frames and estimate there are 14400
bees in the hive, the full strength is 24000 and you have a Grade A colony.
Jorg
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