| Summary: | At various physiological stages of postnatal ontogenesis of egg-laying hens, the linear size and weight of the ovary, as well as the changing properties of their histological structures, were studied. Absolute indicators of the linear size and weight of the laying of hens show a slight increase in the intensity of postnatal ontogenesis from 15 days to 35 days, and this condition lasts up to 120 days due to the period of puberty of hens, while the physiological stage of maturity (168 days) is the highest; it was found that the morphometric parameters of the ovary decrease to 570 days in relation to the stage of generative withering of ovarian function in postnatal development after 168 days; it was recorded that the growth coefficient of morphometric parameters of the ovary of chickens is higher in weight than in linear dimensions, from 15 days to 570 days, days of postnatal ontogenesis; it was found that there are not so many primary follicles in the ovaries of chickens and that they are mainly located in the submesothelial connective tissue of the folds of the cortex of the bottom of the ovary, the presence of single and group gonocytes not surrounded by follicular epithelial cells, medium-sized gonocytes, hyperchromia of the ovaries of the nucleus, in which the nuclei are indistinctly visible and it was found that in a well-formed primordial In the follicle, the egg cell occupies the entire space.
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