. The Canadian field-naturalist. 1976 Bunnell and Olsen: Weights and Growth of Dall Sheep 159. X X males ^—o ^ females 0 2 4 6 8 10 12 AGE (YEARS) Figure I. Weight versus age for wild male and female Dall sheep (curves are fit by eye). ( kg). Average weights of adult ewes are about 66% of average weights of adult rams. This value falls within the range of 61-77% reported for sheep of four subspecies of Ovis canadensis by Blood et al. (1970). Patterns of growth in chest-girth are similar to those for weight. Chest-girth in rams appears to increase at least to 10 years of age (Figure 2). The
. The Canadian field-naturalist. 1976 Bunnell and Olsen: Weights and Growth of Dall Sheep 159. X X males ^—o ^ females 0 2 4 6 8 10 12 AGE (YEARS) Figure I. Weight versus age for wild male and female Dall sheep (curves are fit by eye). ( kg). Average weights of adult ewes are about 66% of average weights of adult rams. This value falls within the range of 61-77% reported for sheep of four subspecies of Ovis canadensis by Blood et al. (1970). Patterns of growth in chest-girth are similar to those for weight. Chest-girth in rams appears to increase at least to 10 years of age (Figure 2). There are fewer measures for ewes, but the full adult girth is apparently attained earlier. The differences in weight between sexes are not clearly reflected in differences in chest-girth or total length (Figure 3), particularly in the 2- to 4- year-old age classes. Although length measures are slightly larger in males than in females there generally is less sexual differentiation in these measures than in weight measures (Table 1). There is a weak tendency for growth in total length to continue past the age of 4 years in both sexes. Growth in hindfoot length, tail length, and ear length (data not shown), however, does not continue past 4 years of age for either sex (Figure 3). These patterns of growth are similar to those documented for Rocky Mountain bighorn (Blood et al. 1970) and California bighorn, (O. c. californiana (Sugden 1961), and corroborate the general observations made for the genus Ovis by Cowan (1940). Coefficients of variation for most measures are less than (Table 1). Live weights of rams. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
Size: 965px × 2589px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafieldnaturalistsclub, bookcentury1900, bookcolle
