Controlled test evaluation of the benzimidazole anthelmintic VET 220-S alone or with concomitant trichlorfon treatment against naturally acquired gastrointestinal parasites in ponies.
A controlled test was done in 30 naturally infected ponies to evaluate the antiparasitic activity of the dienbendazole analog VET 220-S given alone or with trichlorfon (TCF) by nasogastric intubation. Six ponies were nontreated; 6 were given VET 220-S (5.0 mg/kg); 6 were given TCF (40 mg/kg); 6 were given VET 220-S (2.5 mg/kg) and TCF (40 mg/kg); and 6 were given VET 220-S (5.0 mg/kg) and TCF (40 mg/kg). All ponies were euthanatized and necropsied 7 or 8 days after treatment. Draschia megastoma, Oxyuris equi, Strongylus vulgaris, S edentatus, and small strongyles were removed efficaciously by all doses of VET 220-S. Habronema muscae and microfilariae of Onchocerca cervicalis were not removed by VET 220-S or TCF. Gasterophilus intestinalis was 97.9% removed by TCF. Pregnant mares in all groups were not adversely affected by treatment, except for 1 mare that had diarrhea after TCF treatment. Parasite eggs per gram and larval culture data agreed with necropsy data.
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Sandhill Equine Center, Southern Pines, NC 28387.
D000818:Animals; D000871:Anthelmintics / Q000627:therapeutic use*; D001562:Benzimidazoles / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D005243:Feces / Q000469:parasitology; D005260:Female; D006734:Horse Diseases / Q000188:drug therapy*; D006736:Horses; D007411:Intestinal Diseases, Parasitic / Q000188:drug therapy / Q000662:veterinary*; D008297:Male; D010270:Parasite Egg Count / Q000662:veterinary; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000188:drug therapy / Q000662:veterinary; D014236:Trichlorfon / Q000627:therapeutic use*
D000871:Anthelmintics; D001562:Benzimidazoles; C062729:dienbendazole; D014236:Trichlorfon