This study was carried out to investigate the effect of synchronization of estrus and induction of superovulation after administration of altrenogest, PMSG and HCG in the multiparous sows weaned at 50-56 days. A total of 100% of the treated sows exhibited estrus within a four-day period. The average number of ovulation points per sow among superovulated breeds such as Landrace, Large White, Duroc and Hampshire was between 17.6 and 24.0.