Patterns of secretion of GnRH, LH and FSH during the postovulatory period in mares: mechanisms prolonging the LH surge

blood caballos cheval ciclo estral cycle oestral fsh gnrh gonadotrophine gonadotropin releasing hormone gonadotropinas gonadotropins hfs hormona liberadora de gonadotropina horses jument lh mares oestrous cycle progesterona progesterone sang sangre secretion yegua