An Evaluation of Drug Treatment for Lungworm in Bighorn Sheep

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Abstract
Excessive mortality of bighorn sheep lambs (Ovis canadensis canadensis) resulting from impairment of the respiratory system by the lungworm (Protostrongylus spp.) is linked to heavy loads of the parasite transmitted from the pregnant ewe to the fetus. Experiments with various chemotherapeutic drugs showed that lamb survival can be increased by administering Cambendazole (isopropyl 2-(4-thiazolyl)-5-benzimidazole carbamate INN) to pregnant ewes and that populations of adult lungworms in the lungs of bighorn sheep can be reduced or eliminated by administering Fenbendazole (methyl-5(phenylthio)-2-benzimidazole-carbamate). Recommended dosages are 8.4 g Cambendazole and 2 separate treatments each of 3.0 g Fenbendazole/adult ewe. Treatment of free-ranging sheep is done by mixing the drug dose with an ensiled apple pomace bait. General guidelines and suggestions for field application are given.

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