PURPOSE:To assist the metabolism of bees, promote the physiological activation and further oviposition of the queen bee and growth of bee larvae, by mixing an acidic fermentation product prepared by fermenting a grain with a microorganism with a beekeeping feed and feeding the resultant mixture to bees. CONSTITUTION:A grain, e.g. rice, wheat or barley, corn or beans, is used as a raw material to prepare KOJI, which is then fermented to give an acidic fermentation product. The above-mentioned acidic fermentation product in an amount of about 3% based on a beekeeping feed, e.g. sugar liquid or honey, is mixed therewith, and the resultant mixture is fed to bees.
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