Diagnostic accuracy of estimating the number of CL and ovarian volume to predict superovulatory response in dairy cattle

The superovulatory response of 44 dairy cattle was assessed by estimating the number of CL and ovarian volume per rectum before non-surgical recovery of eggs. The study included the recovery of greater than or equal to 3 total eggs and greater than or equal to 2 viable/transferable embryos which were then used retrospectively to determine the diagnostic accuracy of rectal palpation in predicting superovulatory response. When 0.5) when 5-12 CL were palpated. The Receiver Operating Characteristic (ROC) curves demonstrated that estimating the number of CL was more accurate than the ovarian volume in assessing superovulatory response. The best cutoff point. where fewest mistakes were made, was when 9 CL were palpated. At this point of maximum accuracy, the likelihood ratio for a positive test result in the recovery of greater than or equal to 2 viable embryos was 6.5 and that of a negative test result was 0.3. In conclusion, it was shown that the estimation of the number of CL per rectum in order to predict the recovery of greater than or equal to 3 eggs or greater than or equal to 2 viable/transferable embryos was diagnostically optimized when 5-12 CL were palpated.