Observations on the transmission of Nematodirus helvetianus to calves at pasture.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000209:etiology* / Q000517:prevention & control; D005243:Feces; D007814:Larva; D009348:Nematoda / Q000254:growth & development / Q000472:pathogenicity; D009349:Nematode Infections / Q000209:etiology / Q000517:prevention & control / Q000662:veterinary*; D010270:Parasite Egg Count; D010944:Plants; D012008:Recurrence; D012621:Seasons; D013997:Time Factors; D014252:Trichostrongyloidiasis / Q000209:etiology