Abstract
Small colonies of emerged bees were kept in confinement, and fed fresh pollen, or pollen two years old supplemented with: nothing, pantothenic acid, 20% dried brewers' yeast, 20% vitamin-free casein, casein plus pantothenic acid. The number of sealed brood cells in these colonies (in the above order) was 8·9, 1·0, 2·8, 4·4, 5·6, and 5·8 times the number in the colonies fed old pollen alone. Deterioration of proteins and of pantothenic acid is thus partially responsible for the inferior value of stored pollen for brood rearing.

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