Individual study: Colonies fed fresh rather than dried pollen produce larger queens, in artificially reared buff-tailed bumblebees Bombus terrestris; laboratory studies at the University of Utrecht, Utrecht, The Netherlands
Ribeiro M.F., Duchateau M.J. & Velthuis H.H.W. (1996) Comparison of the effects of two kinds of commercially available pollen on colony development and queen production in the bumble bee Bombus terrestris L (Hymenoptera, Apidae). Apidologie, 27, 133-144
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Rear declining bumblebees in captivity
Ribeiro et al. (1996) showed that eight laboratory-reared B. terrestris colonies fed on freshly frozen honey bee Apis mellifera pollen produced larger queens, which survived better and produced larger colonies after hibernation than queens from seven colonies fed on dried, commercially available honey bee pollen. There was no difference in the number or weight of workers or males from colonies fed on these two types of pollen.