The morphology of the lungs of newborn pigs, Landrace and Duroc in a comparative perspective

Abstract

Human cadaver material for the study was delivered to the Department of anatomy of animals FGBOU VO "Saint-Petersburg state Academy of veterinary medicine" from a pig-breeding complex "Idavang agro" D. Nurma, Tosnenskiy district of Leningrad region. The age of pigs ranged from 1 to 30 days of birth by age groups: 1-7 days; 10-17 days; 20-28 days. Breeds of pigs - Landrace and Duroc. Upon examination of the lungs determined by the number of shares, size, degree of development of connective tissue stroma and the working tissue of the parenchyma, distinctness of segments and lobes of the lung. The fresh and frozen lungs of pigs of both breeds received from the killed animals subjected to thin anatomical preparation. A saggital incision from the tip to the base of the lungs was used, followed by dissection. Linear parameters of lungs were determined by electronic caliper model "Tamo professional" with a scale of division of 0.05 mm, made in the USA. The absolute mass of the liberated lungs was determined on the electronic scales "CAS 0,2 HFS". Thus, came to a conclusion that to age group of newborn pigs of 10-14 days of breed Landrace and Duroc, the absolute weight of a lung as a whole increases on the average 1,6-1,7 times in comparison with newborns of 1-7 days. In newborns 20-28 days weight of the lung increases in 1,5-1,6 times in comparison with newborns 10-14 days. Consequently, the lungs of newborn piglets of Landrace and Duroc have anatomically well-formed lobes. Increase lung according to age groups occurs evenly and, as a rule, the mass is dominated by the average and caudal proportion.