PECULIARITIES OF VENOUS DRAINAGE OF THE LIVER IN RABBITS OF BREEDS BUTTERFLY IN THE AGE ASPECT
The aim of this study was to study the features of venous outflow from the liver in the studied breed of rabbits in postnatal ontogenesis. The work was carried out in a research laboratory based on the Department of Biology and Soil Science of the Federal State Budgetary Educational Institution of Higher Education «Orenburg State University». The material for the study were liver preparations of rabbits of breed butterfly. Animals were divided into five age groups. The study involved 25 healthy male rabbits: newborns (n = 5), of juvenile period (n = 5), sexual and physiological maturity (n = 5), reproductive (n = 5) and post-reproductive periods (n = 5). It was established that the four main outflow veins serve as the main vessels for the out ow of venous blood into the caudal vena cava. In this breed of rabbits, changes in the length and diameter of veins in the age aspect, their uneven development and age-related involution were also revealed. The minimum morphometric indicators of length are observed in newborn animals, amounting in the left hepatic (25.3 ± 3.1), middle (26.9 ± 2.8), right (14.55 ± 0.7) and caudate (17.2 ± 0.4mm) veins. The maximum values of the lengths of the venous vessels are observed in the reproductive period in one year and three months, reaching 108.5 ± 3.4 mm in the left hepatic vein, 82.2 ± 2.2 - in the middle, 46.7 ± 1.5 - in the right, and 66.4 ± 1.7 - in the caudate, then the growth stops and the reverse development of the indicator is noted. The diameter will change in a similar way, reaching a maximum numerical value at two years and six months of post-natal development. The research results can be used as an anatomical norm by specialists of rabbit farms when breeding of rabbits of breed butterfly.