Gastrointestinal parasites in cattle in Ontario.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D007411:Intestinal Diseases, Parasitic / Q000453:epidemiology / Q000662:veterinary*; D009864:Ontario; D010272:Parasitic Diseases / Q000453:epidemiology; D010273:Parasitic Diseases, Animal; D013272:Stomach Diseases / Q000453:epidemiology / Q000662:veterinary*