Nematode parasitism in cattle.
D000367:Age Factors; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control; D006188:Haemonchiasis / Q000517:prevention & control / Q000662:veterinary; D009349:Nematode Infections / Q000662:veterinary*; D010029:Ostertagiasis / Q000517:prevention & control / Q000662:veterinary; D014253:Trichostrongylosis / Q000517:prevention & control / Q000662:veterinary