China Animal Husbandry and Veterinary Medicine ›› 2025, Vol. 52 ›› Issue (4): 1807-1814.doi: 10.16431/j.cnki.1671-7236.2025.04.032

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Molecular Identification of the Pathogen of Paramphistomiasis in Ordos Fine-wool Sheep and Screening of Deworming Drugs

WURI Lige1, LI Na1, GERILE Gelaba2, HASI Tuya2, ZHANG Jingjing2, HOU Bin3, HASI Surong1   

  1. 1. National Animal Medicine Experimental Teaching Center, Key Laboratory of Clinical Diagnosis and Treatment Technology in Animal Diseases, Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, China;
    2. Wushen Animal Disease Prevention and Control Center, Ordos 017300, China;
    3. Ordos Vocational College of Eco-Environment, Ordos 017010, China
  • Received:2024-06-28 Published:2025-03-29

Abstract: 【Objective】 The purpose of this study was to explore the species of Paramphistomum in Ordos fine-wool sheep and screen out ideal anthelmintic drugs.【Method】 Based on the preliminary diagnosis of paramphistomiasis by fecal egg examination,the Paramphistomum in rumen of Ordos fine-wool sheep were collected through necropsy for morphological and molecular biological identification.Three parasites were randomly selected to extract DNA,and then the internal transcribed spacer 2 (ITS-2) of ribosome was amplified by PCR.After sequencing the amplified products,BLAST alignment analysis was performed in NCBI database,and the phylogenetic tree was constructed.Niclosamide,nitroclofene,rafoxanide and 3% trichlorfon combined with nitroclofene were respectively used to conduct a comparative test on the anthelmintic effects in sheep infected with paramphistomiasis.【Result】 The band size of 441 bp was obtained by PCR amplification of ITS-2 gene,which was consistent with the target gene band.The sequence similarity between the three parasites and the ITS-2 (KJ459936.1) from China was 99.3%,99.3% and 99.8%,respectively.The results of phylogenetic analysis showed that this Paramphistomum was in the same large branch as Paramphistomum from China (KP341671),Ireland (AB973398),Argentina (HM209066) and Germany (MZ532797),and was in a small branch with Paramphistomum cervi,indicating that the Paramphistomum obtained in this study was Paramphistomum cervi.In the anthelmintic test,the egg reduction rates in niclosamide,nitroclofene,rafoxanide and 3% trichlorfon combined with nitroclofene groups were 44.00%,26.73%,23.00% and 90.80%,respectively.【Conclusion】 The Paramphistomum parasitizing in Ordos fine-wool sheep in Wushen Banner,Inner Mongolia was Paramphistomum cervi,and the treatment with a combination of 3% trichlorfon and rafoxanide could achieve a better anthelmintic effect.

Key words: Ordos fine-wool sheep; Paramphistomum; molecular biological identification; anthelmintic effect

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