Some observations on the worm burdens of calves infected daily with Ostertagia ostertagi.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology*; D005260:Female; D005298:Fertility; D010063:Ovum; D013997:Time Factors; D014251:Trichostrongyloidea / Q000254:growth & development / Q000276:immunology*; D014252:Trichostrongyloidiasis / Q000276:immunology / Q000662:veterinary*