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Re-evaluation of ivermectin efficacy against equine gastrointestinal parasites. 2001

T R Klei, and S Rehbein, and M Visser, and W K Langholff, and M R Chapman, and D D French, and P Hanson
Department of Veterinary Science, Louisiana Agricultural Experiment Station, Louisiana State University-Agriculture Center, Baton Rouge, LA 70803, USA. klei@vetmed.lsu.edu

Two trials were conducted to confirm the efficacy of ivermectin paste against endoparasites of horses. In these trials, 20 ponies were treated with ivermectin oral paste at 200 mcg x kg body weight once on Day 0, and 20 ponies served as unmedicated controls. The animals carried naturally acquired parasite infections as confirmed by pretrial fecal examination. The animals were necropsied for worm recovery on Days 14, 15 or 16. Parasites recovered were identified to species. Horses treated with ivermectin had significantly (P<0.05) fewer (>99.0% reduction) adult small strongyles (Coronocyclus spp including C. coronatus, C. labiatus, C. labratus; Cyathostomum spp including C. catinatum, C. pateratum; Cylicocyclus spp including C. ashworthi, C. elongatus, C. insigne, C. leptostomum, C. nassatus, C. radiatus; Cylicodontophorus bicoronatus; Cylicostephanus spp including C. asymetricus, C. bidentatus, C. calicatus, C. goldi, C. longibursatus, C. minutus; Gyalocephalus capitatus; Parapoteriostomum spp including P. euproctus, P. mettami; Petrovinema poculatum; Poteriostomum spp including P. imparidentatum, P. ratzii) and adult large strongyles (Strongylus edentatus, S. vulgaris; Triodontophorus spp including T. brevicauda, T. serratus; Craterostomum acuticaudatum) than the controls. Ivermectin was also highly effective (94% to >99%, P<0.05-0.01) against Gasterophilus intestinalis larvae, Habronema spp., Oxyuris equi, Parascaris equorum. The data from these two trials confirm that ivermectin paste administered to horses orally at 200mcg x kg(-1) continues to be highly effective for treatment and control of a broad range of small and large strongyle species as well as other species of gastrointestinal parasites.

UI MeSH Term Description Entries
D007559 Ivermectin A mixture of mostly avermectin H2B1a (RN 71827-03-7) with some avermectin H2B1b (RN 70209-81-3), which are macrolides from STREPTOMYCES avermitilis. It binds glutamate-gated chloride channel to cause increased permeability and hyperpolarization of nerve and muscle cells. It also interacts with other CHLORIDE CHANNELS. It is a broad spectrum antiparasitic that is active against microfilariae of ONCHOCERCA VOLVULUS but not the adult form. Eqvalan,Ivomec,MK-933,Mectizan,Stromectol,MK 933,MK933
D008297 Male Males
D010270 Parasite Egg Count Determination of parasite eggs in feces. Count, Parasite Egg,Counts, Parasite Egg,Egg Count, Parasite,Egg Counts, Parasite,Parasite Egg Counts
D010273 Parasitic Diseases, Animal Animal diseases caused by PARASITES. Parasitic Infections, Animal,Animal Parasitic Disease,Animal Parasitic Diseases,Animal Parasitic Infection,Animal Parasitic Infections,Disease, Animal Parasitic,Diseases, Animal Parasitic,Infection, Animal Parasitic,Infections, Animal Parasitic,Parasitic Disease, Animal,Parasitic Infection, Animal
D004064 Digestive System A group of organs stretching from the MOUTH to the ANUS, serving to breakdown foods, assimilate nutrients, and eliminate waste. In humans, the digestive system includes the GASTROINTESTINAL TRACT and the accessory glands (LIVER; BILIARY TRACT; PANCREAS). Ailmentary System,Alimentary System
D005243 Feces Excrement from the INTESTINES, containing unabsorbed solids, waste products, secretions, and BACTERIA of the DIGESTIVE SYSTEM.
D005260 Female Females
D005767 Gastrointestinal Diseases Diseases in any segment of the GASTROINTESTINAL TRACT from ESOPHAGUS to RECTUM. Cholera Infantum,Gastrointestinal Disorders,Functional Gastrointestinal Disorders,Gastrointestinal Disorders, Functional,Disease, Gastrointestinal,Diseases, Gastrointestinal,Functional Gastrointestinal Disorder,Gastrointestinal Disease,Gastrointestinal Disorder,Gastrointestinal Disorder, Functional
D006734 Horse Diseases Diseases of domestic and wild horses of the species Equus caballus. Equine Diseases,Disease, Equine,Disease, Horse,Diseases, Equine,Diseases, Horse,Equine Disease,Horse Disease
D006736 Horses Large, hoofed mammals of the family EQUIDAE. Horses are active day and night with most of the day spent seeking and consuming food. Feeding peaks occur in the early morning and late afternoon, and there are several daily periods of rest. Equus caballus,Equus przewalskii,Horse, Domestic,Domestic Horse,Domestic Horses,Horse,Horses, Domestic

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