The purpose of our study is to study the functional morphology of the Corpus Luteum (CL) of the ovaries of pregnant and infertile cows in normal and pathological conditions. For that purpose, the ovaries of cows were examined after slaughter, histological and histochemical examination of the CL was carried out. For the antemortem examination of the ovary, the biopsy method developed by us was used. The effect of the synthetic analogy of prostaglandin F2α-Klatiram was studied experimentally. It was established that the CL and luteal formations of the ovaries of those animals had significant changes in structure, which allowed us to develop morphological markers for diagnosing their morphofunctional state. It was found that the mass and size of the CL increases by two months, decreases by three months and then remain relatively stable. There is a growth of antral follicles that reach a size of more than 1 cm and then they undergo atresia of the obliteration type. The CL of the ovary cycle reaches its maximum development in the first ten or twelve days. Later, against the background of venous hyperemia and atrophic changes, it decreases, the lobulation of the parenchyma disappears and the vessels sclerose (the stage of involution). A method of biopsy of the bovine ovaries has been developed. The use of this method, with the experimental introduction of a synthetic analog of prostaglandin F2a, has proved that luteolytic processes in the CL of the ovary cycle develop due to violations of the microcirculatory bloodstream, development of necrobiotic processes in the parenchyma and stromal vascular dystrophy of the mesenchyma of the gland.
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