Shakhov P. Morphofunctional features of intraorganes blood vessels and tissue components of lymphatic nodes of calves and piglets

Dissertation is devoted to research of peculiarities of structure cross-section of intraorgan blood vessels and tissue components, their common action in somatic and visceral lymphatic nods of the calves and piglets of 1-day age with high and low morphofunctional organism status, of 5-, 10-, 20-day's age. The analysis of their growing and development in the new-born period of animals was made. During dissertation preparation zootechnical, morphological (gross and microscopic) and statistic venerate methods were used. It is found by made research, that blood vessels of limphocytopoiesis (lymphatic nodes) are represented by arteries and veins of musular tape, and also by vessels of microcirculatory flow. Arterial and vein wall consists of 3 envelops, which is characteristic for other organs of limphocytopoiesis. Blood vessels with the largest cross-section are sutured in the portal of lymphatic nodes. Arteries which penetrate through the portal into parenchyma of lymphatic nodes divide to smaller, supplying cortical and medullar zones with blood. Blood vessels, with the smallest cross-section are situated in capsule of somatic and visceral lymphatic nodes. Numerous vessels of microcirculatory flow in lymphoid tissue of lymphatic nodes form small nets. Relative area of blood vessels somatic lymphatic nods and connective tissue frame of 1-day age animals is larger comparing to visceral ones. Animals with low alive weight, especially piglets, have the area of blood vessels of lymphatic nodes larger than the animals with high alive weight, which may be explained by enlarging of the cross-section and the wall becoming thiner, as a result of their fulfillment with blood. With the age of piglets and calves the area and cross-section of blood vessels changes asynchronously. Structural peculiarities of blood vessels and tissue components of lymphatic nodes depend on morphofunctional status of 1-day age animals. The area of diffusion lymphoid tissue and node form prevails in visceral lymphatic nodes, especially of piglets. Till the of neonatal period the increase of relative area of blood vessels takes place within decrease of diffusional lymphoid tissue with increase of lymphoid nodes in piglets and calves, which is characteristic for visceral lymphatic nodes.