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SUMMARY: Ovogenesis and foliculogenesis in the mare differ from other farm animals and therefore, gamete manipulation, invitro fertilization and embryo transfer have been very difficult. The histologic traits of ovaries from 12 mares, in estrus and dies trus werestudied. Number and size of follicules and corpora lutea were recorded. The ovarian stroma was evaluated using the pricosirius techniquefor collagen. A simple morphometric analysis was done using computerized scanner programs. During late estrus, one dominant fol licle(46 ± 4mm) is seen. The surrounding stroma contains collagen I and III. By the end of the estrus, one hemorrhagic follicle is seen, plusone or two small follicle (2 mm in size). In early diestrus there is a corpus luteum (43-60 mm) and some antral follicles (6 ±1). CollagenI forms strands inside the corpus luteum and predominates in the perifollicular ovarian stroma. Modifications of the extracellu lar matrixmay change cell function by way of integrines, the matrix being in turn modified by hormones and other tissular factors. Estrog ens canbe related to collagen III predominance in ovarian stroma whereas progesterone is associated with increased collagen I. Therefore,follicular-stromal interactions are important in ovarian histophysiology.

Follicular-Stromal Interaction in Mare Ovary During the Reproductive Cycle