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Article
Daily Rhythmicity of Core and Surface Temperatures of Sheep Kept Under Thermoneutrality or in the Cold
Research in Veterinary Science (2013)
  • Giuseppe Piccione
  • Matteo Gianesella, Università degli Studi di Padova
  • Massimo Morgante, Università degli Studi di Padova
  • Roberto Refinetti, University of South Carolina
Abstract
We compared the daily rhythms of body core temperature and surface temperature in 10 Comisana ewes housed at thermoneutrality (25º C) and in the cold (9º C). Core temperature was measured with a rectal probe, wheras surface temperature (in the eye, forehead, and foot) was measured by infrared thermography, at 3 h intervals for 27 consecutive hours under each condition. We found a robust rhythm of core temperature, whose amplitude doubled from 0.2º C at thermoneutrality to 0.4º C in the cold. The surface temperatures were all lower than core temperature and exhibited weaker but significant daily rhythmicity. At thermoneutrality, foot temperature (an indicator of vasodilation in the service of heat loss) peaked 3 h before rectal temperature. Studies on other species are needed to clarify whether the latency between the peaks of the oscillations in food and core temperature vary in a species-specific manner and are responsible for the generation of the core temperature rhythm.
Keywords
  • circadian rhythm,
  • cold exposure,
  • core temperature,
  • ovis aries,
  • surface temperature,
  • thermography
Disciplines
Publication Date
August, 2013
Citation Information
Giuseppe Piccione, Matteo Gianesella, Massimo Morgante and Roberto Refinetti. "Daily Rhythmicity of Core and Surface Temperatures of Sheep Kept Under Thermoneutrality or in the Cold" Research in Veterinary Science Vol. 95 Iss. 1 (2013)
Available at: http://works.bepress.com/roberto_refinetti/3/