Observations on the faecal egg count of calves naturally infected with Ostertagia ostertagi.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases; D005243:Feces; D005260:Female; D008433:Mathematics; D010063:Ovum; D014251:Trichostrongyloidea; D014252:Trichostrongyloidiasis / Q000662:veterinary*