The effectiveness of the synchronization and the pic of the luteinizing hormone with various progestagens and routes of application was assessed in two experiments in which goats have received one of the following three progestagens protocols treatment: 1 : vaginal sponge soaked with 45 mg of fluorogestone acetate, 2. a half subcutaneous implant, 3. a whole ear implant concentrated at 3 mg of Norgestomet. In the experiment 1, we assessed the onset of estrous manifestations, the occurrence of the preovulatory peak of luteinizing hormone as well as the percentage of ovulation occurrence after the synchronization treatment of the estrous cycles of 234 cyclic goats. In the experiment2, 340 non-cycled goats were tested to determine the time of onset of estrous manifestations, the percentage of ovulation, of fertility as well as the rate of prolificity after the induction of estrus and the use of artificial insemination with frozen sperm-thawed 24 hours after the onset of estrous manifestations. The interval between the onset of estrus and the occurrence of the preovulatory peak of LH was significantly variable in goats that received half an implant of norgestomet. To conclude, the synchronization of the estrous cycles by means of implants or semi-implants of norgestomet does not seem to reduce the variability of the appearance of the estrous manifestations either the preovulatory peak of the luteinizing hormone.