EN
Recognition of pregnancy was done in a flock of 104 Polish mountain ewes. The first examination was performed about 30 days after the rams were separated from the ewes, and then they were tested at 10 day intervals. A Toshiba ultrasonograph with a 5 MHz head was used for examinations. For comparison the ewes were tested for pregnancy with a Preg-Alert ultrasound apparatus produced by Renco- (USA). In the first examination conduced 30 days after the rams were separated, 68% of pregnancies were detected by the use of USG whereas only 29% of later confirmed pregnancies were detected by the ultrasound apparatus. During the second test performed 10 days later, 100% of pregnant ewes were confirmed by USG and 93% by the ultrasound apparatus. The results point to a great effectiveness of the USG method for detecting pregnancies in ewes at about 50 days after breeding.