Studies were carried out on 33 Polish Merino sheep. They concerned macro-morphological changes in the sexual organs during the postpartum period. Observations were made from the first to the 41st day postpartum. Changes in the sexual organs were described, as follows: skin swelling and colouring around perineum and vulvar lips, shape and size of the vaginal part of the uterine cervix, colour of the mucosa in the vaginal part of the uterine cervix, degree of opening of the external orifice of the uterine cervix, amount, consistency and colour of the postpartum discharges and uterine mucus. Observations revealed that in the examined group of ewes of the Polish Merino sheep the genital tracts became totally clean of the postpartum discharges, the mucosa of the vaginal part of the uterine cervix and of the vagina regained its normal colour by the 21st day of postpartum. The external orifice of the uterine cervix and the cervical canal also closed completely by this time. On the other hand, changes as to the shape and size of the vaginal part of the uterine cervix persisted as long as 33 days postpartum.
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