| Use of ultrasonography for improving reproductive efficiency in cows I. Accuracy of rectal palpation and ultrasonography for determining the presence of a functional corpus luteum in subestrous daitry cows |
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Chang-ho Son1, Byong-kyu Kang2, Han-sun Choi2, Hyun-gu Kang2, Ki-seok Oh2, Chang-rok Shin2 |
1Hormone Research Center, Chonnam National University
2College of Veterinary Medicine, Chonnam National University |
| 초음파 진단장치를 이용한 축우의 번식효율증진에 관한 연구 I. 무발정 젖소에서 기능성황체를 평가하기 위한 직장검사와 초음파검사의 진단정확성 |
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손창호1, 강병규2, 최한선2, 강현구2, 오기석2, 신창록2 |
1전남대학교 호르몬연구센터
2전남대학교 수의과대학 |
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| Abstract |
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The accuracy of rectal palpation and ultrasonography for predicting the presence of a functional corpus luteum in subestrous dairy cows was investigated, using the result of a radioimmunoassay for progesterone in plasma. Luteal status (high or low progesterone concentrations) was diagnosed in 820 cows, using rectal palpation and B-mode transrectal ultrasonography, and the results of rectal palpation and ultrasonography were compared in $2{ imes}2$ contingency table with plasma progesterone concentrations. A $2{ imes}2$ contingency table analysis allowed the calculation of sensitivity, specificity and predictive values for rectal palpation and ultrasonography. The sensitivity, specificity, predictive value of a positive test and predictive value of a negative test were 81.9%, 67.5%, 79.0% and 71.4% for rectal palpation, and 96.3%, 88.8%, 94.5% and 92.4% for ultrasonography, respectively. The percentages of observed agreement and expected agreement between rectal palpation and ultrasonography were 71.8% and 57.1%, respectively. An evaluation of agreement between rectal palpation and ultrasonography, the value of Kappa was 0.34. It was concluded that a ultrasonography was more sensitive and specific than rectal palpation in predicting the presence of a functional corpus luteum. Therefore, ultrasonographic examination is a reliable method for assessing the functional status of ovarian structures in subestrous dairy cows. |
| Key Words:
functional corpus luteum, progesterone, rectal palpation, ultrasonography, predictive value, subestrous cows |
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