Common Internal Parasites of Cattle
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Although there are many species of worm parasites harbored in the gastrointestinal and respiratory tracts of cattle, only a few target species are clinically and economically important. These include the brown stomach worm Ostertagia the coccidia Eimeria bovis and the lungworm Dictyocaulus. These are of great significance throughout the United States and worldwide, with Ostertagia considered the single most important parasite of cattle. And this is true for native Missouri cattle as well as for cattle imported into Missouri.
Archive version. For the most recent information see extension.missouri.edu.