Abstract
All medium and large follicles were counted and measured in twenty-four pairs of ovaries belonging to rats killed at seven different phases of the oestrous cycle. The follicles were classified into seven size groups, and their frequency distribution determined for the different phases of the cycle. Follicles with a diameter of 350–449 μ were most numerous at early dioestrus; those with a diameter of 450–549 μ at dioestrus; 550–649 μ at early oestrus, and those measuring more than 650 μ at oestrus. The differences between the peak numbers of follicles in these various size groups and those characterizing other phases of the cycle were in many instances significant at the 2% level.
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