1Department of Veterinary Parasitology, IIVER, Rohtak, Haryana, India
2Department of Veterinary Medicine, IIVER, Rohtak, Haryana, India
3Department of Veterinary Gynaecology and Obstetrics, IIVER, Rohtak, Haryana, India
4Department of Veterinary Surgery and Radiology, IIVER, Rohtak, Haryana, India
5Department of Veterinary Parasitology, LUVAS, Hisar, Haryana, India
*Corresponding author: V Bhardwaj; E-mail: vaibhav.bhardwaj55@gmail.com
Online Published on 30 December, 2022.
In present study two organized and six unorganized farms of sheep from three agro-climatic zones of Haryana were surveyed to assess the prevalence of anthelmintic resistance in gastrointestinal nematodes to fenbendazole (@ 5 mg/kg b.wt. orally), closantel (@ 10 mg/kg b.wt. orally) and ivermectin (0.2 mg/kg, subcutaneous injection) by faecal egg count reduction test (FECRT). Per cent reduction in faecal egg counts by fenbendazole (FBZ), closantel (CLS) and ivermectin (IVM) in organized farms ranged from 53.24-60.60% (FBZ), 74.24-76.62% (CLS) and 63.63-69.69% (IVM) while unorganized farms 59.62-75.56% (FBZ), 79.19-92.47% (CLS) and 69.94-82.79% (IVM). Over all per cent reduction in faecal egg counts in organized and unorganized farms ranged 53.24-75.56% (FBZ), 74.24-92.47% (CLS) and 63.63-82.79% (IVM), respectively. In all cases of anthelmintic resistance, Haemonchus contortus was the predominant parasite involved. Reduction in faecal egg counts indicate multidrug severe to moderate resistance in sheep farms of different agro-climatic zones of Haryana.
• H. contortus resistant to anthelmintics.
• Fenbendazole showed severe to moderate resistance, while Closantel & Ivermectin showed moderate resistance.
Anthelmintic resistance, Closantel, Haryana, Sheep
