Concentrations of inhibin, progesterone and oestradiol in fluid from dominant and subordinate follicles from mares during spring transition and the breeding season.

摘要: Abstract Dominant and subordinate follicles were collected from mares on the day after dominant follicle reached 30 mm in diameter, to investigate regulation of folliculogenesis during spring transition breeding season. Concentrations oestradiol-17β, progesterone inhibin A, but not isoforms with pro- αC-immunoreactivity, significantly higher preovulatory than anovulatory transitional follicles. Steroidogenic activity was regained gradually successive waves through transition. The follicles, both cyclicity, contained concentrations oestradiol, αC-isoforms, results indicate that high follicular levels A are associated continued growth ovulation. low oestradiol deficiency steroidogenesis exists early steroidogenic pathway. similarity patterns hormones cyclicity strongly suggests mechanism dominance is same types follicle.