The objective of this work was to analyze the concentrations of progesterone (P4) and estrogen (E2) hormones changed during estrus synchronization in dairy heifers. Estrus synchronization was carried out with CIDRⓇ (Controlled Intravaginal Drug Release) devices. Corpus luteum (CL) was classified into three grades based on its size and palpable characteristics. The concentrations of P4 and E2 were measured by enzyme-amplified chemiluminescence. Serum P4 concentration was markedly low at the estrus stage (36 hrs after removal of CIDR) compared to other stages, while E2 concentration was kept high during estrus stage. The serum P4 concentration was highest in the CL classified into gradeⅠ. These results indicate that P4 concentration could be used as a criteria for determining recipients for artificial insemination or embryo transfer in dairy cattle.

ABSTRACT   서론   재료 및 방법    젖소 발정동기화    P4, E2 호르몬 농도 분석    황체 발달 등급 확인    통계분석   결과 및 고찰    발정동기화 처리 시기별 P4, E2 농도 변화    발정동기화 처리에 따른 황체 발달 등급 및 등급별 P4 농도    발정동기화 처리에 따른 수정란이식 당일 수란우의 P4 농도 분석   인용문헌

• 최창용(농촌진흥청 국립축산과학원) | Changyong Choe
• 허태영(농촌진흥청 국립축산과학원) | Tai-Young Hur
• 정영훈(농촌진흥청 국립축산과학원) | Young-Hoon Jung
• 조용일(농촌진흥청 국립축산과학원) | Yong-Il Jo
• 백광수(농촌진흥청 국립축산과학원) | Kwang-Soo Baek
• 정연섭(농촌진흥청 국립축산과학원) | Yeon-Sub Jung
• 한태석(농촌진흥청 국립축산과학원) | Tai-Seok Han
• 이경석(농촌진흥청 국립축산과학원) | Kyung-Seok Lee
• 권응기(농촌진흥청 국립축산과학원) | Eung-Gi Kwon
• 강다원(경상대학교 의학전문대학원 생리학교실ㆍ건강과학연구원) | Dawon Kang
• 손준규(농촌진흥청 국립축산과학원) | Jun-Kyu Son Corresponding author