Prevalence of gastrointestinal nematodes, parasite control practices and anthelmintic resistance patterns in a working horse population in Egypt

Salem, S E, Abd El-Ghany, A M, Hamad, M H, Abdelaal, A M, Elsheikh, H A, Hamid, A A, Saud, M A, Daniels, S and Ras, R (2020) Prevalence of gastrointestinal nematodes, parasite control practices and anthelmintic resistance patterns in a working horse population in Egypt. Equine Veterinary Journal. ISSN 2042-3306

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Abstract

Background: Anthelmintic resistance is commonly reported in horse populations in developed countries, but evidence in some working horse populations is either lacking or inconclusive. Objectives: To estimate prevalence of GI nematode infections in working horses in Egypt and to evaluate strongyle resistance to ivermectin, doramectin and fenbendazole. Study Design: Cross-sectional study Methods: Faecal egg count was performed on 644 working horses from 2 provinces in Egypt. A short questionnaire about horse signalment and worming history was completed for each horse. Horses identified with ≥50 strongyle type egg/g (n = 146) underwent faecal egg count reduction testing (FECRT) following treatment with ivermectin (n = 33), doramectin (n = 33) or fenbendazole (n = 30). Risk factors for strongyle (≥200 egg/g) and Parascaris equorum (>0 egg/g) infection were investigated using multivariable logistic regression analyses. Results: The prevalence of low (0–199 epg), medium (200–500 epg) and high (>500 epg) strongyle infection was 88.4%, 5.9% and 5.8%, respectively. P. equorum eggs were detected in 5.1% (n = 33) of horses. Strongyle FECR was 100%, 99.97% and 100% following treatment with ivermectin, doramectin and fenbendazole, respectively. Anthelmintic treatment in the 12 months preceding examination was associated with reduced likelihood of strongyle infection (odds ratio [OR] = 0.26, 95% confidence interval [CI] = 0.14, 0.47, P <0.001). The likelihood of P. equorum infection was significantly associated with horses’ age (OR = 0.78, 95% CI = 0.69, 0.90; P <0.001). Male horses were more likely to have P. equorum infection (OR = 2.86, 95% CI = 1.37, 5.93, P = 0.005). Main Limitations: Nonrandomised selection of study areas and larval cultures were unsuccessful for some samples Conclusions: There were low prevalence of strongyle and P. equorum infection and no evidence of macrocyclic lactones or benzimidazole resistance in strongyles in the studied working horse population.

Item Type: Article
Keywords: horse, working horses, Egypt, Strongyle, P. equorum, anthelmintic resistance, doramectin
Divisions: Equine Management and Science
Depositing User: Dr Simon Daniels
Date Deposited: 30 Jul 2020 10:51
Last Modified: 30 Jul 2020 10:51
URI: https://rau.repository.guildhe.ac.uk/id/eprint/16408

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