Diachenko T. 3. Peculiarities of the structure of ovaries of cows of the black-and-spotted in the ecological conditions of Zhytomyr region

The thesis presents a research of the morphological condi-tion of ovaries of cows born and kept on the third zone of the radioactive contamination. A series of radiological, pathologoanatomic and morphometric analyses has been carried out with the aim to investigate the ovaries of the cows at the post-natal stage of their ontogenesis (from 4 months to 19 years of age). The research covered the cows which had been under constant influence of low dozes of ionizing radiation. The analyses made it possible to determine organometric indices of ovaries, and also relative and absolute indices of ovary macro- and microstructures. These indices testify to the negative impact of ionizing on animals. Comparison with the control animals showed that organometric and volume indices of ovaries of 4-5-month-old cows (lastic stage of post-natal ontogeneses) are increas-ing, whereas those of 12-19-year-old cows (lastic stage of post-natal ontogenesis) are increasing, whereas those of 12-19-year-old cows (ageing stage) are decreasing. At the height of the reproductive function 5-6-year-old cows), mor-phometric ovary indices of cows kept on territories contami-nated by radionuclids considerably differed from those of the animals in the control group and depended on the stage of the reproductive cycle.The radiological and morphometric research data obtained significantly contribute to the present-day understanding of the morpho-functional state of the reproductive system of animals kept on radiation-contaminated territories