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In the present paper the results are given of studies on the effectiveness of various TAO modes in obtaining embryos in culture in vitro. Follicle puncture was performed two and four times a month with a week break after aspiration, four and eight times a month without interruption, and also strictly regularly every three and seven days. As the analysis of the obtained results shows, performing the aspiration procedure strictly every seven days reduced the number of aspirated follicles in comparison with other donor groups by 4.2-12.8%, but at the same time increased the total oocyte yield by 7.9-16.1 pp. The yield of oocytes suitable for cultivation was 5.5-13.5 pp higher when performing aspiration once every other week (twice a month) and amounted to 84.9%. The yield of embryos from the number of fertilized eggs was higher when aspirated twice a week every other week (four times a month with a weekly break) and amounted to 32.5% versus 20.0 -25.0% in other groups of animals.

EFFICIENCY OF DIFFERENT MODES OF USING DONORS IN OBTAINING CATTLE EMBRYOS IN VITRO IN THE SYSTEM OF TRANSVAGINAL ASPIRATION OF OOCYTES (TAO)