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KESTER WO 《Journal of the American Veterinary Medical Association》1957,131(11):suppl 14 passim
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In a 2-year study of 49 Oklahoma cattle with a typical history of clinical endoparasitism, 12 animals had Ostertagia only, and Ostertagia was the predominant endoparasite in 21. Only 1 animal had a pure Haemonchus population. Though primary endoparasitism was diagnosed antemortem in 32 animals, postmortem worm counts confirmed the diagnosis in only 19. Worm counts documented inapparent disease in 8 animals. In 21 cases of suspected of toxicosis, 12 animals had endoparasitism none was poisoned. 相似文献
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Veenis M 《The Canadian veterinary journal. La revue veterinaire canadienne》2004,45(11):891; author reply 891
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