책임운영기관 농촌진흥청 국립축산과학원 (로고)

The purpose of this study was to investigate the effect of human chorionic gonadotrophin (hCG) treatment on pregnancy 5 days after artificial insemination in Korean cows. To test the effect of hCG, estrus synchronization treatment was performed for 7 days, and artificial insemination was carried out 2 days later. On the 5th day after artificial insemination, hCG was injected intramuscularly at a concentration of 1,500 IU. Pregnancy rates were examined by two methods of pregnancy diagnosis at 28 and 90 days after AI. The main results were as follows: The final pregnancy rate was 84.7% in the hCG treatment group and 80.8% in the untreated control group, showing a trend of 3.9 percentage points in favor of the treatment group. Body Condition Score (BCS) outcomes were significantly (P<0.05) higher in the control group with a BCS score of 2.6 to 3.5 than in the other two bands; however, there was no significant difference between BCS bands in the hCG-treated group. Final pregnancy rates tended to be higher with hCG treatment and were relatively elevated in heifers compared to multiparous ones. In conclusion, hCG injection on the 5th day after artificial insemination was effective in enhancing pregnancy maintenance in hanwoo cows