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چکیده
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Purpose The aim of this study was to determine molecularly the species of larvae of trichostrongylid nematodes in arrested development in the abomasum of sheep from Iran and their seasonality. Methods A total of 240 sheep abomasa were randomly collected at diferent seasons from Ilam abattoir in 2017–2018. The adult nematodes were isolated and identifed. The mucosa of the abomasum was removed and digested using a pepsin solution. DNA from diferent parts of the abomasum was extracted using a SinaPureTM kit. Polymerase chain reaction (PCR) amplifcation was performed; the ITS2-rRNA gene was amplifed using specifc primers. Amplifed PCR products were purifed and sequenced by Bioneer Corporation (South Korea). The obtained ITS2 sequences were aligned using BLAST analysis and submitted to GenBank. Results Morphologically, fve species of adult nematodes of four genera including Haemonchus contortus, Marshallagia marshalli, Marshallagia occidentalis, Parabronema skrjabini, and Teladorsagia circumcincta were identifed. Marshallagia marshalli (65.4%, 120.2±28.5) had the highest prevalence during autumn. Molecularly, arrested development of larvae of M. marshalli and T. circumcincta were demonstrated in mucosa of the abomasum in autumn and early winter using PCR of the ITS-2 region of rRNA. Conclusion The results evidenced the frst molecular characterization of the larvae of trichostrongylid nematodes from abomasum of sheep from Iran.
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