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Abstract : This study aimed to diagnose Abomasal Nematodes and investigate some Immunological parameters in Sheep infected with Kirkuk City. The current study involved the examination of 50 sheep infected with abomasal nematodes, which were collected randomly and submitted to the laboratory tests in Kirkuk Teaching veterinary hospital from different regions and from the slaughter of Kirkuk city for microscopic and serological diagnosis of recovered nematodes, for the period from September 2021 to April 2022. Weakness and emaciation were the most clinical signs shown on diseased animals; with fewer rates were pale mucous membranes, diarrhea, and bottle jaw (submandibular edema). Blood samples were collected from the Sheep to determine the effect of these nematodes on some Immunological parameters. The results showed the eggs in feces and worms of nematodes identified in the abomasum, and that made according to morphology and length of worms include the: Ostertagia circumcincta 42%, Marshallagia marshall 28%, Haemonchus contortus 20%, and Trichostrongylus spp. 10%, The results showed a significant increase (P ≤ 0.05) in the rates of IgG (80.27 ± 2.4 µg/dl) and (56.3± 1.7 µg /dl) respectively and a reduction in the rate of IgM (31.8 ± 5.2 µg/dl) in infected sheep comparing with the control group.

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