Bu çalışmada, koyunlarda aşımı izleyen 17, 25 ve 34. günlerde transrektal ultrasonografl, serum progesteron düzeyinin belirlenmesi ve vaginal smear yöntemlerinin gebelik tanısındaki etkinliğini araştırmak amaçlanmıştır.Aşımı izleyen 17. günde, doğru tanı yüzdesi (%78.0), 25 (97.5) ve 34 (%100)! günlere göre istatistiki açıdan önemli olacak şekilde düşük bulundu (P

The aim of this study was to determine the availability of three different pregnancy diagnosis methods "serum progesterone assay, transrectal B-mode real-time ultrasonography, cytological examination of vaginal smear" on days 17th, 25th and 34th post breeding in the ewes. The percentage of ewes accurately diagnosis by transrectal ultrasonography was lower on days 17th (78. 0%) than on days 25th (97. 5%) and 34th (100%) as statisticaly (P<0. 05). Progesterone concentration in the non-pregnant and pregnant ewes showed significantly differences on the 34th day (P<0. 005). Parabasal cell count in the non-pregnant and pregnant ewes showed significantly differences on the 17th, 25th and 34th days. In conclusion, the use of real-time transrectal ultrasonographic scanning of ewe on days 25th and 34th of gestation offers a safe, rapid, accurate, reliable and practical means of diagnosis pregnancy. On days 17th, 25th and 34th, accu-racy rate of pregnancy diagnosis by assay of serum progesterone level was 87. 5% and was lower than that of guess. Pregnancy diagnosis by examination of the celluler content of vaginal smear was not reliable because of minimum and maximum parabasal cell count were similar in the non-pregnant and pregnant ewes.