Ostertagia ostertagi in calves: clinical parasitism and resistance.
D000018:Abomasum / Q000469:parasitology; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology / Q000469:parasitology*; D005243:Feces / Q000469:parasitology; D008297:Male; D010029:Ostertagiasis / Q000276:immunology / Q000469:parasitology / Q000662:veterinary*; D010270:Parasite Egg Count; D014252:Trichostrongyloidiasis / Q000662:veterinary*