Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Horn Growth and Population Quality in Dall Sheep

Fred L. Bunnell
The Journal of Wildlife Management
Vol. 42, No. 4 (Oct., 1978), pp. 764-775
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3800767
Stable URL: http://www.jstor.org/stable/3800767
Page Count: 12
  • Download ($42.00)
  • Subscribe ($19.50)
  • Cite this Item
Horn Growth and Population Quality in Dall Sheep
Preview not available

Abstract

Measures of horn growth of Dall sheep (Ovis dalli dalli) are compared with physical, demographic, and meteorological measurements. Horn growth is not correlated with body size in either ewes or rams. Rams showing rapid early growth of horn show slower subsequent growth. Gradual wear influences the measured length of the lamb annulus in both ewes and rams. Horn growth is a function of precipitation, implicating primary production, and shows marked differences between years. These differences appear to be correlated with recruitment. Horn growth of rams is more strongly affected by differences in environmental conditions between years than is horn growth of ewes. In good years, growth is enhanced uniformly over all ram age-classes; in poor years growth in younger age-classes is depressed more severely than is growth in older age-classes. Condition of the dam can affect horn growth of rams for a period of at least 5 years following birth. Useful indices of quality can be constructed from simple measurements such as length of annuli provided the lamb annulus is ignored and affects of calendar year are acknowledged. Measures presented argue for the importance of range quality in the production of trophy animals.

Page Thumbnails

  • Thumbnail: Page 
764
    764
  • Thumbnail: Page 
765
    765
  • Thumbnail: Page 
766
    766
  • Thumbnail: Page 
767
    767
  • Thumbnail: Page 
768
    768
  • Thumbnail: Page 
769
    769
  • Thumbnail: Page 
770
    770
  • Thumbnail: Page 
771
    771
  • Thumbnail: Page 
772
    772
  • Thumbnail: Page 
773
    773
  • Thumbnail: Page 
774
    774
  • Thumbnail: Page 
775
    775