title: Critical anthelmintic trials in ponies with oxfendazole and caviphos and concomitant studies on the spontaneous elimination of small strongylids.
abstract: The efficacy of the benzimidazole, oxfendazole, and the organophosphate, caviphos, against gastrointestinal parasites of ponies was evaluated by the critcial test method. Oxfendazole (10 mg/kg of body weight) given in single oral doses was 100% effective against adult large strongylids (Strongylus vulgaris, Strongylus edentatus, and Strongylus equinus), 99% effective against adult small strongylids, and 97% effective against 4th-stage small strongylids (genera identified in order of frequency: Cylicostephanus, Cyathostomum, Cylicocyclus, Triodontophorus, Poteriostomum, Oesophagodontus, Cylicodontophorus, Gyalocephalus, and Craterostomum). Caviphos (40 mg/kg of body weight) admixed in the grain ration (horse crunch) was 89% effective against adult large strongylids (S vulgaris and S edentatus) and 99% effective against adult small strongylids (genera identified earlier in order of frequency above), but only 35% effective against 4th-stage small strongylids. Both drugs were effective (100%) against adult and immature pinworms (Oxyuris equi) but ineffective against Habronema spp and Draschia megastoma. Oxfendazole was only 11% effective against stomach bots (Gasterophilus spp); caviphos was 73% effective against these species. During a three-day pretreatment interval, about 34% of the total population of small strongylids was lost spontaneously from the 29 ponies.
mesh_terms: D000818:Animals; D000871:Anthelmintics / Q000627:therapeutic use*; D001562:Benzimidazoles / Q000627:therapeutic use*; D002219:Carbamates / Q000627:therapeutic use*; D004006:Dichlorvos / Q000031:analogs & derivatives; D004175:Diptera; D005260:Female; D006736:Horses; D007306:Insecticides / Q000627:therapeutic use*; D008297:Male; D009943:Organophosphorus Compounds; D010272:Parasitic Diseases / Q000188:drug therapy; D010273:Parasitic Diseases, Animal; D013319:Strongyle Infections, Equine / Q000188:drug therapy*
chemical_list: D000871:Anthelmintics; D001562:Benzimidazoles; D002219:Carbamates; D007306:Insecticides; D009943:Organophosphorus Compounds; D004006:Dichlorvos; C020718:caviphos