The use of intravaginal progestagen sponges (MAP or FGA), 300 or 500 IV PMSG, and implementation of one or two inseminations following synchronization, were evaluated in 600 Merino ewes with a mean body mass of 30,6 kg, outside the normal breeding season. The conception rates obtained with AI were significantly (P < 0,01) higher than with natural mating at the second cycle (63,5 vs 47,6%). FGA-treated ewes (irrespective of PMSG dose, number of inseminations, or ram breed) gave a significantly (P < 0,01) higher conception rate than those treated with MAP sponges (68,3 vs 58,2%). The increase of PMSG dose from 300 IV to 500 IV did not significantly increase conception rate, although fecundity and lambing rates were significantly (P < 0,01) higher with a higher dose of PMSG (1,11 vs 1,29 and 69,4 vs 83,9% respectively). A significant (P < 0,05) interaction was recorded between sponge type and the number of inseminations regarding the lambing rate, with FGA sponges and two inseminations being superior (98,2%). Fecundity was not significantly affected by the sponge type and number of inseminations although a significant (P < 0,05) interaction between PMSG dose and the number of inseminations was recorded. Results confirm FGA sponges to be superior to MAP sponges (P < 0,01) in conception and lambing rate following synchronization and 500 IV PMSG being more advantageous (P < 0,01) for lambing rate and fecundity, outside the breeding season. Two inseminations did favour a higher (P < 0,01) conception and lambing rate, compared to a single insemination.