الفهرس 
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Abstract
This study was conducted to investigate the prevalence of gastrointestinal nematodes
in ruminants in Ismailia, Port-said and Damietta cities, during a period from October
2016 to September 2017. A total of 130 fecal samples were collected from sporadic
cases for parasitological examination and also 60 abomasal samples and 36 small
intestinal samples were collected from slaughtered animals in abattoirs then examined
to detect the adult nematode parasites. The results indicated that sheep was infected
with 5 species of nematodes 3 in abomasum and 2 types in small intestine. The
prevalence of the infection in faecal samples was 26.15% and in abattoir samples
were 30% for the abomasal samples and 11.11% for small intestine samples. The
results recorded the high prevalence of the nematodes in young animals (6-12 Ms)
more than in adult with percentage of 71.42% in ovine sp., 14.28% in bovine sp. and
0.0% in caprine sp. The prevalence in male sheep was higher than in female with
percentage 60% and 30% respectively. There were a variation in prevalence in
relation to location of the animals as Damietta city was the highest (47.6%) then in
Ismailia city (29.16%) and 0.0% in Port-said city. In addition to there were variation
in prevalence in relation to months as the higher prevalence in September (66.67%).
The most prevalent species of nematodes in abomasum was Haemonchus contortus
(26.67%) then Ostertagia sp. (10%) and Trichostrongylus axei (3.33%). In small
intestine, the recorded nematodes were Cooperia sp. (11.11%) and Nematodirus sp.
(5.56%). The results reported the presence of histopathological changes in abomasum
as there was massive destruction and desquamation with severe destruction of mucosa
that lead to focal necrosis of the superficial layer of mucosa and in submucosal glands
also changed and showing diffuse mucinous degeneration with leukocytic
infiltrations. Concerning the efficacy of anthelmintics, faecal egg count reduction test
was carried out on Ivomec super & Albendazole and proved the Ivomec was more
potent than Albendazole in treatment of GINs.