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A retrospective review of disease diagnoses in caribou from Canada Trent K. Bollinger & Dwight Welch Canadian Cooperative Wi ld l i f e Health Centre, Department o f Veterinary Pathology, Western College o f Veterinary Med ic ine , University o f Saskatchewan, Saskatoon, Saskatchewan, Canada S 7 N O W O . Abstract: W e compiled reports on 418 caribou specimens submitted to veterinary diagnostic laboratories and wildlife agencies f rom across Canada. The earliest record was from 1969; however, the majority were f rom 1987 to the present. Mos t submissions were tissues from huntershot animals. Brucella suis and Brucella sp. (untyped) were the most c o m m o n bacterial pathogens isolated, accounting for 69 and 16 cases respectively. Parasitic conditions were also c o m m o n . Besnoitiosis was diagnosed i n 40 cases from various locations i n the Northwest Territories, northern Brit ish Co lumbia , Alberta, Saskatchewan and Manitoba. Cysticercosis was diagnosed i n 49 cases. Fibropapillomas, l ikely o f viral origin, were present i n 5 cases. Individual cases o f chondrosarcoma, pulmonary carcinoma and renal adenoma were also reported. Deficiencies i n data collection were also noted; i n 43% o f cases the age o f animal was not reported and i n 42% o f submissions the sex o f the animal was not indicated. The Canadian Cooperative Wi ld l i f e Health Centre has established a central repository for disease diagnostic reports w h i c h w i l l be useful i n identifying disease problems and geographic occurrence o f disease i n caribou. A standardized reporting format w h i c h includes accurate information on location, age, and sex o f animal is required. Rangifer, Special Issue No. 9, 395 Caribou calf weight gain in relation to habitat use on summer range Brad Griffith, Noreen E. Walsh & Thomas R. McCabe U S Fish and Wi ld l i f e Research Centre, 101-12th Ave . , B o x 20 Fairbanks, Alaska U S A 99701. Abstract: W e estimated the relationship between daily weight gain o f caribou calves and their proportional use o f 5 habitats on the Arct ic Nat ional Wi ld l i fe Refuge coastal plain during 1992 and 1993. Calves (1992, n=80; 1993, n=72) were captured, weighed and equipped w i t h radio-collars w h e n approximately 1 day old. These calves were recaptured w i t h netguns and reweighed at approximate ages o f 3 weeks (1992, n=62; 1993, n=61), and 6 weeks (1992, n=12; 1993, n=15). Proportional habitat use between weighings was estimated from aerial relocations o f the collared calves. Da i ly gain was higher during the first 3 week period (1992, x = 0.380 k g / D , SE = 0.051; 1993, x = 0.441 k g / D , SE = 0.064) than during the second 3 week period (1992, x = 0.344 k g / D , SE = 0.056; 1993, x = 0.193 k g / D , SE = 0.091) i n each year. Da i ly gain i n each 3 week period differed between years. Habitat use differed between the first and second 3 week periods and between years. Weight gain was associated w i t h proportional habitat use i n each 3 week period and i n each year, but the relationships between daily gain and habitat use varied between the two 3 week periods and between years. Positive, neutral, or negative relationships between daily gain and proportional habitat use may be used to rank habitats as having high, medium, or o w value, respectively. O u r results suggest that the value o f a habitat can change w i t h i n and between years. Rangifer, Special Issue No. 9, 395 W e estimated the relationship between daily weight gain o f caribou calves and their proportional use o f 5 habitats on the Arct ic Nat ional Wi ld l i fe Refuge coastal plain during 1992 and 1993. Calves (1992, n=80; 1993, n=72) were captured, weighed and equipped w i t h radio-collars w h e n approximately 1 day old. These calves were recaptured w i t h netguns and reweighed at approximate ages o f 3 weeks (1992, n=62; 1993, n=61), and 6 weeks (1992, n=12; 1993, n=15). Proportional habitat use between weighings was estimated from aerial relocations o f the collared calves. Da i ly gain was higher during the first 3 week period (1992, x = 0.380 k g / D , SE = 0.051; 1993, x = 0.441 k g / D , SE = 0.064) than during the second 3 week period (1992, x = 0.344 k g / D , SE = 0.056; 1993, x = 0.193 k g / D , SE = 0.091) i n each year. Da i ly gain i n each 3 week period differed between years. Habitat use differed between the first and second 3 week periods and between years. Weight gain was associated w i t h proportional habitat use i n each 3 week period and i n each year, but the relationships between daily gain and habitat use varied between the two 3 week periods and between years. Positive, neutral, or negative relationships between daily gain and proportional habitat use may be used to rank habitats as having high, medium, or o w value, respectively. O u r results suggest that the value o f a habitat can change w i t h i n and between years. Rangifer, Special Issue No. 9, 395 Rangifer, Special Issue No. 9, 1996 395