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Preservation of oocyte and granulosa cell morphology in bovine preantral follicles cultured in vitro. 1994

J R Figueiredo, and S C Hulshof, and R Van den Hurk, and B Nusgens, and M M Bevers, and F J Ectors, and J F Beckers
Department of Animal Endocrinology and Reproduction Faculty of Veterinary Medicine University of Liège, B-4000 Liège, Belgium.

Described in the present paper is a culture system that preserves oocyte and granulosa cell morphology in bovine preantral follicles during 5 d in vitro. The effects of additional hypoxanthine and energy substrata (i.e., pyruvate and glutamine) on the morphology of cultured preantral follicles were investigated. It was shown that addition of a mixture of pyruvate, glutamine and hypoxantine to the culture medium increased the percentage of follicles with an intact oocyte from 29.4 to 78.6%. Morphological criteria are described to discriminate between normal and degenerated preantral follicles during culture by inverted microscopy. In addition, the importance of histological evaluation to judge the quality of oocyte and granulosa cells is demonstrated.

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