الفهرس 
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Abstract
In the present study, fecal specimens of 260 sheep were microscopically examined for detection of gastrointestinal nematodes eggs, during the period from March 2010 to February 2011 in Beheira province. Eggs of different types of these nematodes were observed after flotation technique in 197 out of 260 fecal specimens, with infection rate of 75.77%. The rate of infection was higher in autumn 98.5%, spring 81.2%, winter 73.7% and summer 55%.
Also this study included prevalence of gastrointestinal nematodes though fecal culture. Larvae of eight types of gastrointestinal nematodes were identified; they were belonging to the following nematodes: Haemonchus spp., Trichostrongylus spp., Ostertagia spp., Cooperia spp., Oesophagostomum spp., Chabertia spp., Bunostomum spp. and Strongyloides spp.
Concerning the seasonal prevalence of gastrointestinal nematodes through fecal culture showed that the third stage larvae were detected in 183 out of 260 (70.38%) specimens and Seasonal dynamic of the infections rates were autumn 98.5% followed by winter 73.7%, spring 64.7% then summer 55%.
Most prevalent 3rd larval stage is Haemonchus spp., Ostertagia spp., Bunostomum spp., Cooperia spp., Trichostrongylus spp., Chabertia spp., Oesphagostomum spp. and Strongyloides spp. respectively.
Examination of 10 gastrointestinal tracts from slaughtered sheep from abattoirs of El Delengat, Etay Elbarud, and Kom Hamadah at Beheira Province. The result showed that; adult nematode worms were collected from three out of ten gastrointestinal tracts of sheep. Adult nematodes were detected only in abomasums, while both small and large intestines were negative. The recovered worm was Haemonchus contortus (male and female). Number of the recovered worms ranged 5 to 150 worms.
Abomasa of naturally infected animals microscopically, found that hyperplasia of glandular epithelium and focal mononuclear cell proliferation and hyperplasia of mucous secreting epithelium in the deep portion of mucosa.
Regarding to biochemical studies, 70 sera sample collected from naturally infected sheep with gastrointestinal nematodes found that decrease serum total protein, serum albumin and albumin/ globulin ratio and increase serum globulin.