Descripción: “...The study was carried out in two stages in reproductive season. In the first experiment, 12 females were induced with Carp Pituitary Extract (CPE) (5.5 mg/Kg of BW), administered in 2 injections (0.5 mg/Kg and 5 mg/Kg), with intervals of 12 h; fifteen minutes before concluding the period of latency four treatments they were evaluated (0, 1.5, 3.0 or 6.0 µg/Kg of BW of PGF2α of the females). ...”