Out of the examined livers of some farm animals (1000 sheep, 825 cattle, 1740 buffaloes and 1360 camels) of different ages and sexes were slaughtered at abattoirs of Cairo, Giza and Kalubia provinces during the period from January 2011 to March 2013, the incidences of the parasitic affections were 5.20%, 3.27%, 2.31% and 3.31% , respectively. Fascioliasis was recorded in the incidence of 4.10 % (sheep), 2.67 % (cattle), 2.11 % (buffaloes) and 0.15 % (camels) meanwhile hydatidosis revealed incidence of 0.40 % (sheep), 0.61 % (cattle), 0.20 % (buffaloes) and 3.24 % (camels). Cysticercosis was recorded in sheep (0.70 %). Lesions in acute fascioliasis were severe congestion, hemorrhagic migrating tracts formed from degenerated hepatocytes, erythrocytes and eosinophils beside old parasitic tracts represented by central necrosis surrounded with eosinophils, macrophages and lymphocytes together with connective tissue capsule. Chronic fascioliasis characterized by presence of liver flukes within the lumen of the bile ducts in addition to dystrophic calcification in case of cattle, buffaloes and camels but it was not noticed in sheep. Hydatidosis and cysticercosis were characterized by typical cyst formation which may be fertile, sterile, degenerated or calcified.
KEY WORDS: Parasitic affections, Farm animals, Fascioliasis, Hydatidosis, Cysticercosis, Histopathology, Hepatitis.