Hi Ian,

Yes, due to the difficulty in measuring tryptophan, many analyses do not
include it.  I've compiled a list of pollen analyses that did, and I've
also carefully reviewed deGroot's work, and compared it to what we now know
about nutrition of other species, composition of royal jelly, and to the
pollens that have tested in controlled studies to produce the best growth
or survival of bees.

I haven't yet published my revised deGroot ratio (only slight revisions),
but if you are seriously interested please contact me directly.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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