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The purpose of this study was to describe morphological and quantitative aspects of preantral and antral follicles in the equine ovary. Six ovaries were collected from necropsied mares and sliced lengthwise parallel to the ovulation fossa. The slices were fixed and processed for histological evaluation under light microscopy. Preantral follicles were classified according to developmental stage and as morphologically normal or degenerated. Also, another 183 ovaries were obtained from an abattoir. From these ovaries, antral follicles were measured, punctured and oocytes evaluated. Oocyte recovery rates were calculated for each follicle size category. A total of 490 preantral follicles were examined. Primary follicles were in greater number than primordial follicles. No secondary follicles were identified. A total of 518 antral follicles were punctured and evaluated. Total oocyte recovery rate from antral follicles was 47.6. In conclusion, preantral follicles consist of a scarce source in the equine ovary. Antral follicles oocyte recovery rate was higher for smaller-diameter antral follicles.

FOLLICLE POPULATIONS IN MARE OVARIES: FROM PREANTRAL TO PREOVULATORY FOLLICLES