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This study was performed to determine the optimum time for early pregnancy diagnosis with transrectalscanning in ewes. A total of 42 ewes was examined, using a real-time 5 MHz linear-transducer from day 19 to 29(Group I, n = 22) and from day 30 to 44 (Group II, n = 20) after AI or natural mating. Ultrasonic results werecompared with lambing records. Accuracy, sensitivity, specivity, positive and negative predictive values forthese tests were 77.3 %, 84.2 %, 33.3 %, 88.9 %, 25.0 % in Group I, and 80.0 %, 74.3 %, 85.7 %, 90.9 % and 53.8 %in Group II, respectively. No significant differences were seen between the accuracy and positive predictivevalues of Group I and II. It was concluded, that the accuracy of pregnancy diagnosis by real-time transrectalultrasonography can be high already 19 to 29 after AI or natural mating

Early pregnancy diagnosis in ewes by means of transrectal realtime ultrasonography (short communication)