DYNAMICS OF THE INTESTINAL AREA AND LYMPHOID FORMATIONS ASSOCIATED WITH ITS MUCOUS MEMBRANE IN THE EARLY STAGES OF POSTNATAL MORPHOGENESIS IN PIGS
Abstract
The purpose of the research was to determine the dynamics of the intestinal area and the lymphoid structures associated with its mucosa in piglets during early postnatal morphogenesis. The material for the study was the intestines of one-day, ten-day, one-month, and two-month-old piglets of large white breed. After dissection of the abdominal cavity, the intestine was washed with running water and the length and width of the mesentery of the small and large intestines cut by the line of attachment were determined. Determination of the dynamics of the area of lymphoid structures associated with the mucous membrane was carried out using the method of total staining according to Hellman. Absolute and relative areas of intestinal sections and lymphoid formations were determined on total preparations. The obtained data were processed by methods of variational statistics. It was established that at the early stages of postnatal morphogenesis in piglets, the absolute area of the intestine gradually and uniformly increases: from one day to one month of age by 43.2% and from one month to two months of age by 48.5%. The absolute area of lymphoid formations associated with the mucous membrane increases by 80.2% from one day to one month of age, and by 14.1% from one month to two months of age, which indicates their uneven growth and development. The absolute area of the intestine increases uniformly, and the most intensive growth of lymphoid formations is observed in the period from one day to one month of age. The intensity of growth of the thin part during postnatal morphogenesis gradually and uniformly decreases, and the thick part increases. The relative area of lymphoid formations increases before and decreases after the monthly age. This increase in thin and thick sections is 7.9% and 2.4%, respectively. The decrease in the relative area of the lymphoid structures of the specified departments occurs by 6.9% and 1.9%, respectively. The obtained data indicate the asynchrony of the growth of the intestine and the lymphoid structures associated with its mucous membranes. This organ grows uniformly during postnatal morphogenesis. The most intensive growth of lymphoid formations is observed in the period from one day to one month of age.
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