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Over a period of 9 yr, seven white-fronted geese (Anser albifrons) and one Canada goose (Branta canadensis) with multiple intramuscular mesenchymal tumors were encountered in Saskatchewan (Canada) and one similarly affected Canada goose was seen on Prince Edward Island (Canada). The tumors in these ...
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A disease resembling thiamine-responsive polioencephalomalacia of domestic ruminants is described in four wild pronghorn from Saskatchewan. One animal was found dead, two were recumbent and unable to rise and the fourth was staggering and ataxic. Lesions were confined to the brain and consisted of b...
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The Canadian Cooperative Wildlife Health Centre (CCWHC) was established in 1992 as an organization among Canada's 4 veterinary colleges, with a mandate to apply veterinary medicine to wildlife management and conservation in Canada. A major function of the CCWHC is nation-wide surveillance of wild an...
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Three radio-collared Cougars (Felis concolor) in Alberta died from injuries sustained while attacking prey, and a fourth may have died protractedly from such an injury, injuries included a fractured vertebral column, punctured abdominal cavity, severe cranial trauma, and bacterial infection of the t...
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Juvenile rainbow trout were exposed to 36, 171, 1017 or 4887 mg/litre of suspended kaolin clay for 64 days. Gills were analysed qualitatively and quantitatively using histology. Branchial pathology was absent at all sample times exposed to 36, 171 and 1017 mg/litre kaolin, although intracellular kao...
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A report is given of the discovery in New Brunswick in May 1996 of a dead St. Lawrence beluga aged >=34 years and in the latter stages of lactation. It indicates that some old females in this population remain reproducibly active..
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Two groups of rainbow trout fingerlings were exposed for 90 days to 0.2 and 0.4 mg/l of un-ionized ammonia, respectively. Several fish exposed to the higher concentration soon developed clinical signs suggestive of a neurological dysfunction but subsequently recovered. No lesion attributable to ammo...
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Between 1977 and 1981, the Fish Pathology Laboratory of the Ontario Veterinary College received 239 cases from trout farms of southern Ontario, 51 (21.3%) of which had diseased gills. Branchial lesions in 86.3% of these 51 cases were characterized by marked lamellar epithelial hyperplasia with epith...