屠畜韓牛에서 確認된 肝病變의 病理學的 硏究

Pathological studies on hepatie lesions of slaughtered korean beef cattle

In order to investigate the prevalence and type of hepatic lesions in Korean beef cattle, the livers collected from the Suncheon abattoir were examined by gross, microscopic and bacteriological tests. Among 315 livers observed, 140 (44.4%) were confirmed as appearing hepatic changes; the older age, the higher prevalence rate. Main gross lesions of the livers were cholangitis (21.9%), cirrhosis (19.7%), fascioliasis (18.4%), telangiectasis (14.3%), abscesses (12.7%), cholecystitis (6.0%), cholelithiasis (5.1%), cyst (3.2%) and fatty liver (2.5%), respectively. The infection rate of fascioliasis had a tendency of the increase with age. Fifty one (87.9%) of 58 livers with fascioliasis appeared mild infection having less than 30 fasciola hepatica, but one case of adult cows manifested by more than 60 ones. Twenty (34.5%) of 58 fascioliasis was affected more than two hepatic lobes, and fascioliasis occurring single lobe frequently appeared in the left lobe (39.5%) or the right lobe (34.2%). Twenty-one (52.5%) of 40 livers were abscess was caused by parasites and 31 (77.5%) cases of them had only single abscess. From them, there were isolated some causative bacteria including Fusobacterium necrophorum (37.5%), Escherichia coli (32.5%), Staphylococcus aureus (15.0%), Staphylococcus hyicus sub hyicus (5.0%), and Pseudomonas aeruginosa (2.5%). Single bacterial infection was occupied about 60.0%, but more than double ones were 15.0%. Major microscopic lesions in livers with gross changes were bile duct hyperplasia (67.9%), cholangiohepatitis (62.8%), perilobular fibrosis (60.0%), hepatic necrosis (35.7%), telangiectasis (32.1%), fatty degeneration (20.0%), cholecystitis (17.8%), and mineralization (7.1%), respectively. Many of fascioliasis in the study were most likely to associate with the hepatic lesions such as cholangitis, cirrhosis, abscesses, and cholelithiasis. Histopathological findings of the lymph nodes pertaining to diseased livers were frequently observed as lymphadenitis, follicular hyperplasia and congestion. Some of them also showed microabscess, large vacuole formation, hemorrhage, pigmentation, and mineralization.