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Ruminant parasites are found all over the world, including tropical and subtropical regions. Mazandaran province is one of the areas prone to the activity of ruminants in the gastrointestinal tract. This study was performed to identify common gastrointestinal parasites of domestic ruminants (cattle - sheep), infection rate, the effect of seasons and livestock on the rate of infection and determine the severity of infection. In this study, 13 species of gastrointestinal parasites of sheep including: nematodes, Trichoris, Toxocara, Strongyloides, Homoncus, Stratagia, Coperia, Trichostrongylus, Esophagostomum, chabrtia, Fasciola, Dicroselium and Monizia , and 7 genera of gastrointestinal parasites were identified from cows including: Strongyloides, Homoncus, Strategia, Coperia, Trichostrongylus, Esophagostomum, chabrtia. The average percentage of sheep with gastrointestinal parasites was 53.33% and the average percentage of cows with gastrointestinal parasites was 34.58%, which is significantly higher in sheep than cattle (p <0.01). The results of the average percentage of livestock with digestive parasites in sheep and cattle in different seasons showed that the lowest level of infection was related to winter compared to other seasons, which was statistically significant (p <0.05). The results of this study also showed that in relation to parasitic infection in each of the sheep and cattle, the female sex was not significantly different from the male (p <0.05). In addition, 69.52% of sheep and 67.17% of the studied cows had moderate infection severity (average number per gram of sample between 100 and 500). Keywords: Parasitic infections, gastrointestinal tract, Domestic ruminants, Mazandaran
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