Original Research

Sheep enteric cestodes and their influence on clinical indicators used in targeted selective treatments against gastrointestinal nematodes

Salah Meradi, Jacques Cabaret, Bourhane Bentounsi
Onderstepoort Journal of Veterinary Research | Vol 86, No 1 | a1648 | DOI: https://doi.org/10.4102/ojvr.v86i1.1648 | © 2019 Salah Meradi, Jacques Cabaret, Bourhane Bentounsi | This work is licensed under CC Attribution-NoDerivatives 4.0
Submitted: 29 April 2018 | Published: 28 February 2019

About the author(s)

Salah Meradi, Institute of Veterinary Sciences and Agronomic Sciences, University of Batna 1, Algeria
Jacques Cabaret, National Institute for Agricultural Research (INRA), François-Rabelais University, France
Bourhane Bentounsi, Institute of Veterinary Sciences, University of Constantine 1, Algeria


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Abstract

Clinical indicators such as diarrhoea (DISCO) or anaemia (FAMACHA©) are used as a measure for targeted selective treatments against gastrointestinal nematodes (GIN). Enteric cestodes such as Moniezia may interfere directly with DISCO or indirectly with the FAMACHA© score. We investigated 821 Ouled Djellal rams naturally infected in a steppe environment (GIN alone, cestodes alone, GIN and cestodes) or not. The rams were treated with ivermectin 2 months before being slaughtered to reduce the impact of nematodes on the clinical scores; however, persistent or newly acquired GINs were not related to both scores. Of the non-infected rams (n = 296), 26% identified as needing treatment against GIN using the FAMACHA score, and 34.5% using DISCO would have been thus selected. This implies that the clinical indicators used for the targeted selective treatment of gastrointestinal nematodes are not fully reliable when a low infection is recorded and may well be influenced by confounding factors. As expected, only DISCO was affected by cestode infection, and we suggest that the presence of Moniezia should also be taken into consideration.


Keywords

sheep; Cestodes; gastrointestinal nematodes; DISCO; FAMACHA©; Algeria

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