Value of Pollen Substitutes for Brood Rearing of Honeybees1

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Abstract
Queenright colonies of about equal strength composed of emerged bees which had never eaten pollen were kept in confinement and fed soybean flour supplemented with 1-yr.-old pollen, dry skim milk, dried brewers'' yeast and dried egg yolk. The mortality of the exptl. bees and their brood rearing activity were noted. The expt. lasted for 3 consecutive 10-day periods. Mortality in all the exptl. colonies was about the same. Colonies fed soybean flour supplemented with dried brewers'' yeast alone or with an addition of dried egg yolk produced about twice as much brood as those fed soybean flour supplemented with either dry skim milk or pollen.

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