The responses to different ovarian stimulation schedules were studied in women which underwent in programs of assisted fertilization. The follicular development and seric estradiol with the number and quality of the retrieved oocytes. Were correlated 49 patients and divided in 3 groups according to ovarian stimulation schedule were analyzed. The stimulation was followed day by day with seric estradiol and ultrasound follicular measurement. With the three schedules were retrieved 205 oocytes, being mature 179, immature 9 and 17 atretic, there was no significant difference between the different schedules.