A unique case of blood supply of the left ventricle of the heart of a black mottle calf

Abstract

The heart of a domestic bull, like that of other ruminants, according to domestic and foreign authors, has a leftcoronary type of blood supply, which is caused by the dominance of the left coronary artery over the right one in relation to the area vascularized by them and the cross-sectional diameter. In a two-month-old Black-and-White calf, only the right coronary artery took part in the blood supply to the heart, while the left coronary artery was completely absent. In this regard, the purpose of our study was to study the features of the vascularization of the left ventricle of the heart of a Blackand-White breed calf with a right-sided type of blood supply. The corpse of a black-and-white calf at the age of two months served as a material for the study. The methods for the study were fine anatomical preparation and making casts of heart vessels using latex. According to the results of the study, it was found that despite the absence of the left coronary artery, the right coronary artery in a two-month-old Black-and-White calf in several areas of the heart has a very similar branching variability. In this regard, we can assume a sufficient level of compensation for the blood supply to the left ventricle of the heart in this calf. It was determined that the main branches of the right coronary artery, which vascularize the left ventricle, in the studied calf in their topography have frequent S-shaped bends and loose type of division, which can increase the risk of coronary heart pathologies. The data obtained confirm the high degree of variability of coronary arteries in animals, regardless of their species and breed. The results of the study can be used by veterinary specialists as a variant of the anatomical development of the coronary arteries of the heart in farm animals and their possible variability.