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Some aspects of geophagia in Wyoming bighorn sheep (Ovis canadensis)


Geophagia has been commonly reported for bighorn sheep (Ovis canadensis) and other ungulates worldwide. The phenomenon is often attributed to the need to supplement animal diets with minerals available in the soil at mineral lick locations. Sodium is the mineral most frequently cited as being the specific component sought, although this has not been found universally. In this study area, bighorn sheep left normal summer-range to make bimonthly 26-km, 2,000-m-elevation round-trip migrations, the apparent purpose of which was to visit mineral licks on normal winter-range. Lick soil and normal summer-range soil were sampled for their available mineral content and summer-range forage was sampled for total mineral content, and comparisons were made to determine the specific components sought at the lick by bighorn sheep consuming soil. It was concluded that bighorn sheep were attracted to the lick by a desire for sodium but that geophagia also supplemented a diet deficient in the trace element selenium. Where sheep are denied access to licks, populations may be limited by mineral deficiency.

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  1. Ayotte JB, Parker KL, Arocena JM, Gillingham MP (2006) Chemical composition of lick soils: functions of soil ingestion by four ungulate species. J Mammal 87:878–888

    Article  Google Scholar 

  2. Berrow ML, Ure AM (1989) Geological materials and soils. In: Ihnat M (ed) Occurrence and distribution of selenium. CRC Press, Boca Raton

    Google Scholar 

  3. Calef GW, Lortie GM (1975) A mineral lick of the barren-ground caribou. J Mammal 56:240–242

    Article  Google Scholar 

  4. Hebert DM, Cowan IM (1971a) Natural salt licks as a part of the ecology of the mountain goat. Can J Zool 49:605–610

    PubMed  CAS  Article  Google Scholar 

  5. Hebert DM, Cowan IM (1971b) White muscle disease in the mountain goat. J Wildl Manage 35:752–756

    Article  Google Scholar 

  6. Hnilicka PA, Mionczynski J, Mincher BJ, States J, Hinschberger M, Oberlie S, Thompson C, Yates B, Siemer DD (2002) Bighorn sheep lamb survival, trace minerals, rainfall, and air pollution: are there any connections? Bien Symp North Wild Sheep Goat Counc 13:69–94

    Google Scholar 

  7. Holdø RM, Dudley JP, McDowell LR (2002) Geophagy in the African elephant in relation to availability of dietary sodium. J Mammal 83:652–664

    Article  Google Scholar 

  8. Holl SA, Bleich VC (1987) Mineral lick use by mountain sheep in the San Gabriel Mountains, California. J Wildl Manage 51:383–385

    Article  Google Scholar 

  9. Jones RL, Hanson HC (1985) Mineral licks, geophagy, and biochemistry of North American ungulates. Iowa State University Press, Ames

    Google Scholar 

  10. Knight RR, Mudge MR (1967) Characteristics of some natural licks in the Sun River area, Montana. J Wildl Manage 31:293–299

    Article  CAS  Google Scholar 

  11. Kreulen DA (1985) Lick use by large herbivores: a review of benefits and banes of soil consumption. Mamm Rev 15:107–123

    Article  Google Scholar 

  12. National Research Council and Committee on Animal Nutrition (1985) Nutrient requirements of sheep, 6th edn. National Academy Press, Washington, DC

    Google Scholar 

  13. Mincher BJ, Mionczynski J, Hnilicka PA (2007) Soil redox chemistry limitation of selenium concentration in Carex spp. sedges. Soil Sci (in press)

  14. Risenhoover KL, Peterson RO (1986) Mineral licks as a sodium source for Isle Royal moose. Oecologia 71:121–126

    Article  Google Scholar 

  15. Robbins CT (1983) Wildlife feeding and nutrition. Academic, New York

    Google Scholar 

  16. Ryder TJ, Williams ES, Mills KW, Bowles KH, Thorne ET (1992) Effect of pneumonia on population size and lamb recruitment in Whiskey Mountain bighorn sheep. Bien Symp North Wild Sheep Goat Counc 8:136–146

    Google Scholar 

  17. Salter RE, Pluth DJ (1980) Determinants of mineral lick utilization by feral horses. Northwest Sci 54:109–118

    Google Scholar 

  18. Schollenberger CJ, Simon RH (1945) Determination of exchange capacity and exchangeable bases in soil-ammonium acetate method. Soil Sci 59:13–24

    CAS  Article  Google Scholar 

  19. Scott RW (1995) The alpine flora of the Rocky Mountains, V1, The middle Rockies. University of Utah Press, Salt Lake City

    Google Scholar 

  20. Weeks HP (1978) Characteristics of mineral licks and behavior of visiting white-tailed deer in southern Indiana. Am Midl Nat 100:384–395

    Article  Google Scholar 

  21. Weeks HP, Kirkpatrick CM (1976) Adaptations of white-tailed deer to naturally occurring sodium deficiencies. J Wildl Manage 40:610–625

    Article  CAS  Google Scholar 

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Correspondence to B. J. Mincher.

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Communicated by H. Kierdorf

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Mincher, B.J., Ball, R.D., Houghton, T.P. et al. Some aspects of geophagia in Wyoming bighorn sheep (Ovis canadensis). Eur J Wildl Res 54, 193–198 (2008).

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  • Animal nutrition
  • Selenium
  • Mineral licks
  • Sodium