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

초음파 진단장치를 이용한 축우의 번식효율증진에 관한 연구 I. 무발정 젖소에서 기능성황체를 평가하기 위한 직장검사와 초음파검사의 진단정확성

  • Son, Chang-ho (Hormone Research Center, Chonnam National University) ;
  • Kang, Byong-kyu (College of Veterinary Medicine, Chonnam National University) ;
  • Choi, Han-sun (College of Veterinary Medicine, Chonnam National University) ;
  • Kang, Hyun-gu (College of Veterinary Medicine, Chonnam National University) ;
  • Oh, Ki-seok (College of Veterinary Medicine, Chonnam National University) ;
  • Shin, Chang-rok (College of Veterinary Medicine, Chonnam National University)
  • 손창호 (전남대학교 호르몬연구센터) ;
  • 강병규 (전남대학교 수의과대학) ;
  • 최한선 (전남대학교 수의과대학) ;
  • 강현구 (전남대학교 수의과대학) ;
  • 오기석 (전남대학교 수의과대학) ;
  • 신창록 (전남대학교 수의과대학)
  • Received : 1996.04.29
  • Published : 1996.12.25

Abstract

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 $2{\times}2$ contingency table with plasma progesterone concentrations. A $2{\times}2$ 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.

Acknowledgement

Supported by : 한국과학재단