PARASITES FROM CALIFORNIA BIGHORN SHEEP IN SOUTHERN BRITISH COLUMBIA

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Abstract
Seven nematode and two tick species were found during postmortem examination of two adult California bighorns at the Ashnola River, British Columbia. Another nematode and a coccidium were extracted from fecal material by zinc sulphate centrifugal flotation. Protostrongylin lungworm larvae were isolated by the Baermann technique from 80% of 101 fresh bighorn droppings. Little variation in frequency of infection with lungworm larvae was noted among yearling, ewe, and ram groups, but lambs appeared to be freer of the parasite than older animals. Both lambs and yearlings appeared to pass considerably fewer lungworm larvae in their droppings than older animals. The earliest date of collection of an infected lamb dropping was July 6, when the lamb was about 8 weeks old. The bighorn sheep is reported as a new host of the abomasal worm Ostertagia ostertagi (Stiles 1892).

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