Impact of climate on thermal rhythm in pastoral sheep

Tim E. Lowe, Christian J. Cook, John R. Ingram, Phillip J. Harris

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The effects of environmental conditions on temperature rhythms were investigated in ewe lambs at pasture. Two groups of 20 lambs had heart rate (HR), vaginal temperature (Tv), ear-canal temperature (Tc) and ear-pinna temperature (Tp) monitored continuously for 3 days. Climatic conditions were recorded at the same time and Temperature Humidity Index (THI) calculated. One group experienced fine clear weather for the 3 days, the other group experienced 2 days of heavy rain. During periods of fine weather, the daily rhythm for Tv and Tc was monophasic. However, heavy rain and a constant THI reduced the amplitude of the recorded temperature rhythms. Daily Tv and Tc patterns correlated strongly with THI, with a phase lag of 2 h. Peak Tv and Tc were at approximately 17:00 h each day. Mean maximum daily amplitudes were approximately 1.3°C for Tv and Tc. Mean Tv was 39.3±0.1 and 39.6±0.1 for weeks 1 and 2, respectively, while mean Tc was 38.9±0.1 and 39.2±0.1. Changes in Tv and Tc were closely correlated. We conclude that climate has a major effect on body temperature rhythms.

Original languageEnglish
Pages (from-to)659-664
Number of pages6
JournalPhysiology and Behavior
Volume74
Issue number4-5
DOIs
Publication statusPublished - 2001
Externally publishedYes

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Climate
Sheep
Hot Temperature
Temperature
Humidity
Rain
Weather
Ear Auricle
Ear Canal
Body Temperature
Heart Rate

Cite this

Lowe, T. E., Cook, C. J., Ingram, J. R., & Harris, P. J. (2001). Impact of climate on thermal rhythm in pastoral sheep. Physiology and Behavior, 74(4-5), 659-664. https://doi.org/10.1016/S0031-9384(01)00608-4
Lowe, Tim E. ; Cook, Christian J. ; Ingram, John R. ; Harris, Phillip J. / Impact of climate on thermal rhythm in pastoral sheep. In: Physiology and Behavior. 2001 ; Vol. 74, No. 4-5. pp. 659-664.
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Lowe, TE, Cook, CJ, Ingram, JR & Harris, PJ 2001, 'Impact of climate on thermal rhythm in pastoral sheep', Physiology and Behavior, vol. 74, no. 4-5, pp. 659-664. https://doi.org/10.1016/S0031-9384(01)00608-4

Impact of climate on thermal rhythm in pastoral sheep. / Lowe, Tim E.; Cook, Christian J.; Ingram, John R.; Harris, Phillip J.

In: Physiology and Behavior, Vol. 74, No. 4-5, 2001, p. 659-664.

Research output: Contribution to journalArticle

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