Abstract

This study was done in order to investigate the percentage and the cause that lead to trans uterine migration in Awassi ewes. The study depended on collecting 610 female genital tracts of Awassi ewes from Mosul abattoir during the period from 1/10/2002-1/6/2003 through three visits weekly. Single pregnancy represented 94.54% of the total pregnant genitalia, while twinning was seen in (5.45%) among the pregnant genitalia. The study showed 23 case of trans uterine migration. In 9 pregnant uterine samples fetuses were found in the right uterine horns and the corpus luteums were found contra lateral. The uterine migration ratio to the right horns were 23.07% from the whole corpora lutea, where found at the left ovaries (39 corpus luteum). In addition, in 14 pregnant gentila, the fetuses were found on the left uterine horns and its corpus luteums were found on the right ovaries. The ratio of uterine migration to left horn was 17.07% from the whole corpus luteums, which found at the right ovaries (82 corpus luteums). The ratio of uterine migration in twins was much more than single pregnancy, this means the most important causes that lead to uterine migration is crowding in the uterine lumen resulting , the fetus tend to migrate in order to stay alive.