The study was conducted to investigate the comparison of pregnancy rate and transferable embryos produced by genetically superior Korean cows (Hanwoo) of livestock farms. Eighteen Hanwoo donors were superovulated with gonadotropin for 4 days combined with Progesterone Releasing Intravaginal. Embryos were recovered 7 days after the second insemination by flushing the uterus with embryo collection medium. No differences were observed in the efficiency of rate of superovulation in groups A (low nutrition) and B (highnutrition) it was observed to be 100.0% and 87.5%, respectively. The mean numbers of total embryos were 10.8±3.4 and 8.9±2.5, and transferable embryos were 7.5±3.3 and 4.0±1.5 in groups A and B, respectively. The pregnancy rates after embryo transfer were 23.5%, 20.0%, C 80.0% and 55.6% in farm A, B, C, and D, respectively. In conclusion, results suggest that superovulation could be used quite effectively to raise superior Hanwooembryos. However, physical and biological condition of recipients greatly affects the rate of pregnancy.

ABSTRACT   Ⅰ. 서론   Ⅱ. 재료 및 방법    1. 공시축    2. 공란우 과배란처리 및 인공수정    3. 수정란 회수 및 평가    4. 수정란이식 및 임신감정    5. 통계분석   Ⅲ. 결과 및 고찰   Ⅳ. 결론   Ⅴ. References

• 염규태(농촌진흥청 국립축산과학원 가축유전자원시험장) | Gyu-Tae Yeom
• 박해금(농촌진흥청 국립축산과학원 가축유전자원시험장) | Hae-Geum Park
• 김성우(농촌진흥청 국립축산과학원 가축유전자원시험장) | Sung-Woo Kim
• 도윤정(농촌진흥청 국립축산과학원 가축유전자원시험장) | Yoon-Jung Do
• 김현(농촌진흥청 국립축산과학원 가축유전자원시험장) | Hyun Kim
• 김재환(농촌진흥청 국립축산과학원 가축유전자원시험장) | Jae-Hwan Kim
• 김영신(농촌진흥청 국립축산과학원 가축유전자원시험장) | Young-Sin Kim
• 조상래(농촌진흥청 국립축산과학원 난지축산시험장) | Sang-Rae Cho
• 성환후(농촌진흥청 국립축산과학원 가축유전자원시험장) | Hwan-Hoo Seong
• 고응규(농촌진흥청 국립축산과학원 가축유전자원시험장) | Yeoung-Gyu Ko Corresponding author