Variability of resistance of calves to acquisition of infection by Nematodirus Helvetianus.
D000375:Aging; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000276:immunology*; D009349:Nematode Infections / Q000276:immunology* / Q000662:veterinary*; D009747:Nutritional Physiological Phenomena