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 language | English |
|---|---|
| Pages (from-to) | 659-664 |
| Number of pages | 6 |
| Journal | Physiology and Behavior |
| Volume | 74 |
| Issue number | 4-5 |
| DOIs | |
| Publication status | Published - 2001 |
| Externally published | Yes |
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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 journal › Article
TY - JOUR
T1 - Impact of climate on thermal rhythm in pastoral sheep
AU - Lowe, Tim E.
AU - Cook, Christian J.
AU - Ingram, John R.
AU - Harris, Phillip J.
PY - 2001
Y1 - 2001
N2 - 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.
AB - 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.
KW - Climate
KW - Data logger
KW - Pastoral
KW - Sheep
KW - Temperature rhythm
UR - http://www.scopus.com/inward/record.url?scp=0035851845&partnerID=8YFLogxK
U2 - 10.1016/S0031-9384(01)00608-4
DO - 10.1016/S0031-9384(01)00608-4
M3 - Article
VL - 74
SP - 659
EP - 664
JO - Physiology and Behavior
JF - Physiology and Behavior
SN - 0031-9384
IS - 4-5
ER -