الفهرس 
Cover PageOnly 14 pages are availabe for public view
 |  | from | 128 |  |  |
| | | from | 128 | | |
Abstract
The present study was designed for more understanding of the pathological effects of
internal helminthic parasites of native Egyptian sheep, slaughtered at AI_ Moneeb
abattoir, Giza-Govemorate, Egypt, on the gastrointestinal tract and the cellular reactions
against them. Gastrointestinal helminthic parasites of sheep, naturally challenged, elicit
cellular reactions in the tissues causing varying degrees of impact on the infected
tissues. Nematode infections have the greatest impact on the tissues of gastrointestinal
tract. Nematodes: Haemonchus contortus, Trichostrongylus ssp and Cooperia spp.
cause a various gross lesions in the gastrointestinal tract. Cestode infections of sheep
were common and all of them, Moniezia spp., Stilesia spp. and Avitellina spp. share
almost the same gross pathology which is generally little and not specific.
Microscopically, the cellular inflammatory reactions associated with the Haemonchus
contortus infections involving cellular infiltration of eosinophils and mononuclear cells
and the abomasal mucosa showed varying degrees of degeneration to necrosis, with the
appearance of cross sections of probably H contortus developing larval stages, mucosal
hypertrophy, mucous cells hyperplasia, mucosal and submucosal edema, The most
predominant inflammatory cells observed microscopically in all specimens, which play
a role in eliciting and leading the reactions against H contortus were eosinophils,
lymphocytes, mast cells and/or globule leukocytes.