SUMMARYNurse bees were forced to rear brood continuously, under field and laboratory conditions. The weight and the length of life of the bees they reared decreased when the nurse bees were much older than is normal (40–98 days instead of 5–16 days). Intestines of emerged bees reared by nurse bees 50 days old and more were very fragile. In the control colonies these phenomena were not observed.
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Mykola H. Haydak (1963) studied this question.