Schematic diagram of equine chorionic gonadotropin (eCG) treatment after insemination in Creole ewes. Ch=20 mg chronolone in intravaginal sponge; AI=artificial insemination; eCG=application of 330 IU of equine chorionic gonadotropin to the group of ewes that received eCG; BS=blood sample; P4=progesterone concentration; E2=estradiol concentration; LF=large follicles evaluation; LCL=large corpus luteum evaluation; TU=turgid uterus evaluation; PD=pregnancy diagnosis.