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Abstract
The overall prevalence of sheep infestation at Dakahlia governorate was high (76.69%). But, the majority of infested animals were of mild intensity of infestation (counts of 100-500 EPG represents 75.25%, whereas counts of 2000-5000 EPG represents only 2.70%) with mild clinical signs which in the majority of cases ranged from subclinical infection with sheep appearing relatively healthy to mild clinical signs The infestation rate was high in lambs aged 3 months up to 1 year (84.62%) while that in sheep over 2 years (74.21 %) and (70.63%) in sheep aging 1-2 years. The infestation rate was higher during autumn and winter (83.70%) and (80.00%) respectively than those during spring and summer (74.45 and 68.89% respectively) The over all prevalence of \Trichuris ovis 4.32 %, Strongyloides papillosus 9.96%, Nematodirus spp 3.00 %,Trichostrongylus spp.48.5 %, Haemonchus contortus,31.22% and Ostertagia spp.2%.16% Studying the efficacy of some anthelmintics on the treatment of gastrointestinal nematodes in sheep revealed that the mean value of fecal egg counts were reduced 100% in the 7th day post treatment with albendazole, in the 3rd day post treatment with ivermectin and as early as 2days only in moxidectin treated group The comparative effectiveness for the three drugs was therefore, best for the moxidectin