[Pregnancy diagnosis in thoroughbred mares using radioimmunoassay (RIA), enzyme immunoassay (kit) and ultrasound echography (scanning)].

On the basis of progesterone determination on plasma or blood after RIA and the kit method respectively and consecutive scanning performed on a total number of 31 mares the following features were demonstrated: The overall material shows that in 20 mares (64.5%) embryonic vesicles were demonstrated. Of these mares 16 have conceived after service in the 1st estrous cycle and 3 mares in the 2nd estrous cycle. 18 mares were scanned in the time interval 13th-26th day after the latest service, while 2 mares were scanned on day 46 and 41 respectively. A total of 14 scanning positive mares were examined for progesterone by the RIA as well as by the kit method. For these mares (100%) agreement was found between the progesterone analyses as well as with the scanning results. For 19 mares (100%) there was agreement between kit and scanning results. 15 RIA progesterone determinations are in agreement with the scanning results. Progesterone values after the RIA method performed on 15 scanning positive mares were in average 8.40 +/- 2.79 ng/ml plasma. A total of 9 out of 10 scanning negative mares have been examined by the RIA as well as by the kit method. In 6 of these mares with 7 estrous cycles agreement has been found between progesterone analyses and the scanning results (77.8%). In 2 mares (no. 2 and 4) discrepancy has been found in the 2nd estrous cycle between RIA, kit and scanning results. For 1 mare (no. 7) discrepancy has been found in the 1st and 3rd estrous cycle between RIA and scanning.(ABSTRACT TRUNCATED AT 250 WORDS)