>The differences in groups at midwinter is striking!  And due to the
differences in broodrearing as of today (I just returned from the test
yard), I expect the differences to be even more striking come February.
All groups are being fed sugar and syrup for stimulation, but without
adequate protein, a colony simply is unable to sustain broodrearing.


Not surprising.  I'd be willing to bet that you'll find adequate protein
will prove beneficial when other metrics are examined.  Disease resistance,
overwintering, ect.

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