Observations on the faecal egg count of calves naturally infected with Ostertagia ostertagi.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases; D005243:Feces; D005260:Female; D005759:Gastroenteritis / Q000175:diagnosis / Q000453:epidemiology; D009349:Nematode Infections / Q000662:veterinary*; D010063:Ovum