The experiment included 20 ewes of the Tsigai breed, allocated in two groups of 10 animals each. Inducing of oestrus synchronisation was performed during anoestral season (April-May) through vaginal sponges containing gestagens, and administration of Gravohormon (Vetbiopharm, Bulgaria)-500 UI in group 1 ewes and 1000 UI in group 2 ewes. Macromorphological study of the ovaries was carried out by means of laparoscopy after the adopted methods-on the 56 th hour, 72 nd hour and 5 th day following sponge withdrawal and injection of gonadotropin. The levels of the steroid hormones progesteron and 17ß-oestradiol were recorded in three ewes per each group at different times according to the experiment scheme. The histological structure of the ovaries was determined in seven animals subjected to ovariectomy.

The aim of the present study was to test transrectal real-time B-mode ultrasonography for pregnancy diagnosis in ewes from the Ile de France breed on day 16, 23 and 30 after fixed-time artificial insemination. The experiment was carried out with 22 multiparous pure-bred Ile de France ewes aged 2-5 years. Diagnosis of pregnancy was based on the presence of enlarged uterine lumen with amniotic fluid and visualisation of embryo. The accuracy (Ac %), sensitivity (Se %) and specificity (Sp %) of the technique were determined. The gestational phase influenced significantly (P<0.01) the accuracy of the transrectal ultrasonography approach for pregnancy diagnosis. At day 16 the accuracy was 50.0%, whereas at day 23 and at day 30 it reached 72.73% and 90.91% respectively.

Abstract:The experiment included 20 ewes of the Tsigai breed, allocated in two groups of 10 animals each. Inducing of oestrus synchronisation was performed during anoestral season (April -May) through vaginal sponges containing gestagens, and administration of Gravohormon (Vetbiopharm, Bulgaria) -500 UI in group 1 ewes and 1000 UI in group 2 ewes. Macromorphological study of the ovaries was carried out by means of laparoscopy after the adopted methods -on the 56 th hour, 72 nd hour and 5 th day following sponge withdrawal and injection of gonadotropin. The levels of the steroid hormones progesteron and 17ß-oestradiol were recorded in three ewes per each group at different times according to the experiment scheme. The histological structure of the ovaries was determined in seven animals subjected to ovariectomy.

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