| Cooperia bisonis | Species that occurs in cattle, sheep, bison, and pronghorn antelopes. (05 Mar 2000) |
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| Cooperia | A genus of small, slender nematodes (family Trichostrongylidae) inhabiting the small intestine, rarely the abomasum, of ruminants; when fresh they are a bright pink colour; they produce serious effects only when present in large numbers. In partly immune animals, these worms become enclosed in nodules in the wall of the intestine; they are less pathogenic in sheep and goats than the trichostrongyles Haemonchus, Ostertagia, and Trichostrongylus. (05 Mar 2000) |
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| Cooperia curticei | Species that occurs in sheep, goats, and wild deer in Europe, although cosmopolitan in distribution. (05 Mar 2000) |
| Cooperia fieldingi | Species that occurs mainly in cattle, less commonly in sheep, water buffalo, and several wild ruminants; although worldwide in distribution, it is especially widespread in North America and common in Hawaii. Synonym: Cooperia fieldingi. (05 Mar 2000) |
| Cooperia oncophora | Species that occurs in cattle and domestic and wild sheep, but rarely in the horse; although worldwide in distribution, it is most common in the northern U.S. And Canada. Synonym: Strongylus radiatus, Strongylus ventricosus. (05 Mar 2000) |
| Cooperia pectinata | Species that occurs in cattle, sheep, water buffalo, dromedary camels, and various wild ruminants; it is common in the southern U.S. (05 Mar 2000) |
| Cooperia punctata | Species that occurs mainly in cattle, less commonly in sheep, water buffalo, and several wild ruminants; although worldwide in distribution, it is especially widespread in North America and common in Hawaii. Synonym: Cooperia fieldingi. (05 Mar 2000) |
| Cooperia spatulata | A species that occurs in cattle and sheep in the southern U.S., Kenya, Australia, and Malaysia. (05 Mar 2000) |