South Okanagan bighorn sheep facing new threat

PENTICTON – Bighorn sheep in the South Okanagan are facing a new threat on the heels of a pneumonia outbreak in 1999 that decimated the bighorn sheep herd around Vaseux Lake.

Ministry of Forests, Lands and Natural Resource Operations Communications Officer Dave Townsend says ministry technicians discovered Psoroptes obis, or sheep mange, in Similkameen Valley bighorn sheep populations in 2011.

It’s the first time the disease has been seen in Canada since being eradicated from domestic sheep herds in the 1920s.

Townsend says the ministry has been collaring and monitoring bighorn sheep across the infected area, tracking 60 sheep out of the estimated population of three to four hundred in the area so far.

The disease causes hair to fall out, resulting in scaly crusts that may spread to other parts of the body. The animal gets itchy and damages its skin by scratching, resulting in secondary bacterial infections.

Eventually, the sheep lose weight and appetite, resulting in anemia and emaciation.

The reaction to mites in a herd is widely varying, from few signs, such as a few mites in the ears, to massive fatal infections.

The disease can spread to domestic sheep.

The affected herds are in areas west of the east side of the Okanagan Valley. Efforts are being made over the winter to remove bighorn sheep from the McIntyre Bluff area, deemed to be the highest risk area for transmission of the disease to the east side populations.

In some places the valley floor is only 400 metres wide. Ministry officials are concerned infected sheep could potentially come into contact with healthy sheep from the east side of the valley.

By transferring the sheep to areas of the Similkameen where populations have been depressed, the ministry hopes to create a buffer zone around of about 1.6 kilometres between the herds, and also assist in the rebuilding of herds in that area that have been affected by the disease.


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Steve Arstad

I have been looking for news in the South Okanagan - SImilkameen for 20 years, having turned a part time lifelong interest into a full time profession. After five years publishing a local newsletter, several years working as a correspondent / stringer for several local newspapers and seven years as editor of a Similkameen weekly newspaper, I joined iNFOnews.ca in 2014. My goal in the news industry has always been to deliver accurate and interesting articles about local people and places. My interest in the profession is life long - from my earliest memories of grade school, I have enjoyed writing.
As an airborne geophysical surveyor I travelled extensively around the globe, conducting helicopter borne mineral surveys.
I also spent several years at an Okanagan Falls based lumber mill, producing glued-wood laminated products.
As a member of the Kaleden community, I have been involved in the Kaleden Volunteer Fire Department for 22 years, and also serve as a trustee on the Kaleden Irrigation District board.
I am currently married to my wife Judy, of 26 years. We are empty-nesters who enjoy living in Kaleden with our Welsh Terrier, Angus, and cat, Tibbs.
Our two daughters, Meagan and Hayley, reside in Richmond and Victoria, respectively.

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