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Variations of core-temperature rhythms in unrestrained sheep
1Institute of Veterinary-Physiology, Freie Universität Berlin, FRG.
Physiology & Behavior
|September 1, 1990
Summary
Core body temperature rhythms in sheep reveal biphasic circadian patterns and shorter, central nervous system-driven oscillations. Feeding schedules act as key environmental cues influencing these biological rhythms.
Area of Science:
- Physiology
- Chronobiology
- Animal Behavior
Background:
- Understanding core body temperature rhythms is crucial for physiological regulation.
- Circadian rhythms influence various biological processes in mammals.
- Investigating ultradian rhythms provides insights into rapid physiological adjustments.
Purpose of the Study:
- To characterize core body temperature variations in sheep during a normal 24-hour period.
- To identify circadian and ultradian rhythms in core temperature.
- To explore the influence of feeding schedules as environmental cues (zeitgebers).
Main Methods:
- Telemetric core temperature measurements were taken at multiple anatomical locations in 5 male sheep.
- Animals were housed unrestrained in their natural herd environment to minimize stress.
- Data analysis focused on identifying rhythmic patterns and their stability over 24 hours.
Main Results:
- Biphasic circadian rhythms in core body temperature were consistently observed.
- Short-term rhythms with wavelengths of approximately 140 and 90 minutes were detected, independent of measurement site.
- Rhythms at 3 hours, 75 minutes, and 1 hour were less stable and varied in intensity across measurement points.
Conclusions:
- Core body temperature exhibits complex rhythmic patterns, including circadian and ultradian oscillations.
- The central nervous system is a likely origin for the shorter, high-frequency rhythms.
- Distinct organic functions contribute to the observed temperature rhythms, influenced by environmental factors like feeding schedules.