الفهرس 
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Abstract
The present work aimed to study the hepatic affections, identify the possible infectious etiological agents and determine the incidence of these hepatic lesions in some farm animals in Egypt. For this purpose , livers of some farm animals (1000 sheep, 825 cattle, 1470 buffaloes and 1360 camels) were examined and the affected ones were collected from abattoirs of Cairo, Giza and Kalubia provinces during the period from January 2011 to March 2013.Samples and specimens from the affected liver were taken for bacteriological and pathological examination, respectively.
The prevalence of the hepatic lesions was 11.20% in sheep, 6.67 % in cattle, 4.08 % in buffaloes and 6.25 % in camels.
the hepatic lesions in the investigated farm animals (sheep, cattle, buffaloes and camels) were classified according to the etiological agents into the following;
Parasitic hepatic affections:
(1): Fascioliasis: was recorded in the indidence of 4.10 % (sheep), 2.67 % (cattle), 2.11 % (buffaloes) and 0.15 % (camels).
a)- Acute fascioliasis; macroscopically, revealed that the majority of the affected livers were enlarged, firm, congested and oozing blood freely from the cut surface with the presence of multiple reddish or yellowish foci on the surface. Microscopically, severe congestion of central veins, hepatic sinusoids and portal blood vessels was seen. Hemorrhagic migrating tracts formed from degenerated hepatocytes, erythrocytes and eosinophils and surrounded with macrophages and lymphocytes were noticed. Old parasitic tracts represented by central necrotic areas surrounded with leucocytic infiltration especially eosinophils, macrophages and lymphocytes together with fibrous capsule were also found. Hemosiderin pigments were obtained in sheep and cattle. Moreover, severe eosinophilic cellular infiltrtion in the portal areas was recorded in cattle and buffaloes.