This experiment was conducted to investigate the effects of the number of embryos transferred, state (fresh or frozen), developmental stage of embryos and donor-recipient synchrony on pregnancy rate and embryonic loss in cattle. The animals used in this experiment were 95 heads of Korean native cattle, Holstein and crossbred. The results obtained in this experiment are as follows; 1. Fourty six out of 95 recipients (48.4%) were pregnant and embryo mortality rate (EMR) was 23.2%. 2. The pregnancy rate was higher when an embryo was transferred additionally on day 7after the AI on estrus (59.1%) than when one (45.6%) or two (40.0%) embryos were transferred. However, EMR was also higher when an embryo transferred additionally than the other groups. 3. The pregnancy rate of cows transferred fresh embryo was higher (56.0% vs 45.7%) and EMR of fresh embryo transferred cows was lower (20.0% vs 24.3%) compared with those of cows transferred frozen-thawed embryo. 4. The pregnancy rate was slightly higher (50.0% vs 48.1%) when the embryo of blastocyst stage was transferred than when the embryo of morals stage. However, EMR was slightly lower in the cows transferred morals stage embryo (22.8% vs 25.0%). 5. The pregnancy rate when the donors showed estrus 12 hours earlier than the recipients (76.9%) was higher than when the donors and recipients showed estrus at the same time (45.5%) or when the donors showed estrus 12 hours later than the recipients (37.5%). Similar trends were also noted in EMR.