[Results of endocrinologic studies in culture media after coculture of bovine oocytes with granulosa cells].

The steroid hormones progesterone (P.), and testosterone (T.) were radio-immunologically determined in 108 medium samples, following co-culturing of bovine oocytes with granulosa cells. P. and T. values recorded from a control group were lower with significance than those recorded from co-culturing groups, that is 72 +/- 21 ng/ml and 264 +/- 84 pg/ml as compared to 208 +/- 138 ng/ml and 2,168 +/- 1,595 pg/ml in the oocyte plus fresh granulosa cell co-culturing group as well as 364 +/- 215 ng/ml and 825 +/- 233 pg/ml in the oocyte plus pre-incubated granulosa cell co-culturing group. These rises were accompanied by decline in maturation rate, increase in oocyte degeneration, and rises in the rates of fertilisation and segmentation.