Ukrainian Journal of Veterinary Sciences

The parameters of the diameter, caliber and thickness of the internal organs of the blood vessels of vertebral and thoracic parts of the final rib of newborn calves with the use of a complex of morphological methods of research were studied. Compacted bone tissue of the last rib is located under the periosteum of the bony rib. The cells of the primary spongiform bone marrow are filled with osteoblastic bone marrow, and the secondary ones contain red bone marrow. Blood vessels are represented by arteries of muscular and veins of nonmuscular type and microcirculatory vessels. In the vertebral column of the final rib calf of high morph functional status, the largest parameters of the arteries and veins are recorded. The diameter of vessels in the microcirculation bed is also higher in calves of high status, with the exception of the diameter of capillaries. The diameter and caliber of the arteries in the thoracic part of the latter edge are greater in day-old calves of medium morph functional status, and the diameter and caliber of the veins are smaller. The thickness of the artery wall is almost the same in calves of both groups. The diameter of microcirculatory vessels in calves varies unevenly. The intensity of the blood supply of rudimentary bone organs in calves of medium morph functional status is somewhat lower, which may be one of the reasons for the violation of their growth and development in the prenatal period of ontogenesis. 

arteries, veins, microcirculatory vessels, diameter, caliber, wall thickness, bone and cartilaginous tissue, bone marrow, vertebral and thoracic part of the final rib, calves