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Abstract
This study was carried out to determine the incidence and types of liver cirrhosis in the different slaughtered animals. Therefore, a total number of 2460 slaughtered animals including 1085 cattle, 720 sheep, 518 buffaloes and 137 goats were investigated at the Behera abattoirs for cirrhosis.
The cirrhotic cases were 119 with an incidence of 4.79%. These positive cases included 57 cattle with an incidence of 2.31% of the total examined animals, 30 sheep (1.2 1%), 27 buffaloes (1.09%) and 5 goats (0.20%). The encountered types of cirrhosis were, in descending order, biliary cirrhosis (92 cases with an incidence of 3.73%), 19 cases of portal or atrophic cirrhosis (0.77%), 5 cases of post—necrotic cirrhosis (0.20%), 2 cases of central or cardiac cirrhosis (0.08%) and only one case of Glissonian cirrhosis (0.04%).
Biliary cirrhosis was detected in 38 cattle with an incidence of 1.54%, 26 sheep (1.05%), 24 buffaloes (0.97%) and 4 goats (0.16%). In addition, portal cirrhosis was noticed in 12 (0.48%), 4 (0.16%), 2 (0.08%) and 1 (0.04%) cases of cattle, sheep, buffaloes and goats, respectively. Moreover, postnecrotic cirrhosis was evident only in large ruminants and in none of small ruminants (4 cases of cattle (0.16%), and I case in buffaloes (0.04%). Both central and Glissonian cirrhosis were seen only in cattle (2 cases (0.08%) and I case (0.04%), respectively).
Macroscopically, the cirrhotic liver, regardless of the type of cirrhosis, was atrophied, pale, tough, indurated and irregular. The bile duct in case of biliaiy cirrhosis was prominent, thickened and grayish white and sometimes contained adult liver flukes. In Glissonian cirrhosis, the liver capsule was thick and opaque.
Microscopically, the biliary cirrhosis was characterized by perilobular fibrosis tended to encircle the bile ducts; numerous newly formed, non—functional bile ducts; dense aggregates of mononuclear cells including eosinophils in parasitic cirrhosis and atrophied lobules. Portal cirrhosis consisted of fibroplasia that encircled the lobules leading to distortion of the hepatic architecture and very slight bile ducts proliferation and infiltrates of mononuclear cells. Postnecrotic cirrhosis included intralobular fibrosis replacing the areas of hepatocytic cell necrosis. The fibrous tissue began as immature granulation tissue characterized by collagen fibers perpendicular to blood capillaries and ended with mature avascular regular bundles. Central cirrhosis was characterized by fibrosis around the central veins; however, Glissonian cirrhosis appeared as subcapsular fibrous thickening extended deeply to connect the nearest portal triads. In any case, the fibrous tissue stained blue by Masson’s trichrome stain.
Finally, it could be concluded that:
I. The incidence of cirrhosis in slaughtered animals was 4.83%, so it is considered not common in domestic animals, at least in Behera.