Morphology of the Dorper sheep lung bloodstream at the stages of postnatal ontogenesis

Abstract

Sheep farming is one of the main branch of animal husbandry, which is of great national economic importance. For the study at the department of animal anatomy of St. Peters-burg state Academy of veterinary medicine was used cadaver material from animals, obtained during slaughter from the "Gzhelskoe Podvorye", Moscow region. For the study was used a complex anatomical technique, including thin anatomical dissec-tion, vasography and macrophotography. Intravascular injection was performed through the abdominal aorta. The contrasting mass for x-ray diagnostics was a suspension of lead meerkat in turpentine with rectified ethyl alcohol and glycerin. Then the material was fixed for 5 days in 10% formalin solu-tion. X-ray diagnostics of cadaver material was performed on a Gierthhf 200A Power x-ray machine with the following technical conditions: 40 kV, 0.42 mAs. Focal length 90 cm, raster grid was not used. All meas-urements and calculations were performed in the Canon electronic program. Based on our research, we found for the first time that the lungs of the studied animals receive blood from two different vascular systems. The first refers to the small circle of blood cir-culation and is represented by the pulmonary arteries. The second originates from the large circle of blood circulation and is repre-sented by the bronchial arteries. In this case, both systems take an unequal part in the nu-trition of the lungs. Thus, the bronchial arter-ies feed the structures of the bronchial tree, the parenchyma of the lungs, as well as their lymph nodes and pleura. We also found that the largest increase in the diameter of these vessels occurs in these animals from five to six months to one year.