Abstract
Estrogens and progestins protocols are usually applied in equine embryo transfer programs in order to establish pregnancy in non-cyclic mares. Currently, estradiol is applied to acyclic recipient mares and after observation of uterine edema, progesterone or altrenogest is administered during 4 to 8 days. Administration of estradiol prior to progestins is based on cyclic mares researches, …