Korean Journal of Veterinary Research 1998;38(3):642-651.
Use of ultrasonography for improving reproductive efficiency in cows II. Comparative evaluation of ovarian structures using ultrasonography and plasma progesterone analysis in subestrous dairy cows
Chang-ho Son1, Byong-kyu Kang2, Han-sun Choi2, Hyun-gu Kang2, In-seok Paik2, Guk-hyun Suh3
1Hormone Research Center, Chonnam National University
2College of Veterinary Medicine, Chonnam National University
3National Livestock Research Center
초음파 진단장치를 이용한 축우의 번식효율증진에 관한 연구 II. 무발정 젖소에서 초음파검사 및 progesterone 농도측정에 의한 난소 구조물의 비교평가
손창호1, 강병규2, 최한선2, 강현구2, 백인석2, 서국현3
1전남대학교 호르몬연구센터
2전남대학교 수의과대학
3축산기술연구소
Abstract
The accuracy of ultrasonography for determining the presence of a functional corpus luteum in subestrous dairy cows was investigated, using a radioimmunoassay for progesterone in plasma. Luteal status (high or low progesterone concentrations) was diagnosed in 534 cows, using B-mode transrectal ultrasonography. Accuracy of ultrasonography was 96.3% and 88.8% in the cows with and without functional corpus luteum, respectively. In 362 cows diagnosed with functional corpus luteum by ultrasonographic examination, 20 cows were diagnosed with the non-functional corpus luteum by analysis of plasma progesterone concentrations (false positive). In 172 cows with non-functional corpus luteum by ultrasonographic examination, 13 cows were diagnosed with the functional corpus luteum based on plasma progesterone assay (false negative). Most of the corpus luteum with well-defined border and homogeneous echotexture were diagnosed with functional corpus luteum. All cows that were not detected a corpus luteum by ultrasonographic examination were diagnosed as non-functional corpus luteum. The corpus luteum of cows that were diagnosed with false positive appeared homogeneous echotexture and above 15 mm in diameter, but the corpus luteum was the non-functional corpus luteum within Day 5 (Day 0 is ovulation day) or after Day 19. The corpus luteum of cows that were diagnosed with false negative appeared heterogeneous echogenicity and below 15 mm in diameter, but the corpus luteum was the functional corpus luteum after Day 5 or around Day 17. It was concluded that accuracy of ultrasonography was excellent for determining the presence of a functional corpus luteum in subestrous dairy cows. The corpus luteum that was diagnosed with false positive or false negative was the developing or regressing states. Thus, ultrasonography was required a serial examination of two or three times accurately diagnosing these corpus luteum.
Key Words: functional corpus luteum, progesterone, ultrasonography, subesrous cows


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