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This study describes a morphological change in the germinal vesicle (GV) of the sow oocyte during the follicular phase preceding the ovulatory LH surge. Estrus synchronization obtained with methallibure treatment provided a reference point for dating the onset of the follicular phase of each sow in the experiment. The oocyte GV's of preovulatory follicles having a diameter of less than 2 mm (during the first 2 to 3 days of the follicular phase) showed uniformly dispersed chromatin with no condensation, while the GV's of oocytes from preovulatory follicles of more than 2 mm diameter (from days 2 and 3 of the follicular phase to day 5) presented condensed chromatin in the shape of a crown or horseshoe surrounding the nucleolus, and irregular chromatin clusters in the nucleoplasm; these clusters were usually found lying against the nuclear membrane.

In vivo change in the germinal vesicle of the sow oocyte during the follicular phase before the ovulatory LH surge