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Shearing at the end of summer affects body temperature of free-living Angora goats (Capra aegagrus) more than does shearing at the end of winter

Published online by Cambridge University Press:  01 July 2009

R. S. Hetem ,
B. A. de Witt ,
L. G. Fick ,
A. Fuller ,
G. I. H. Kerley ,
S. K. Maloney ,
L. C. R. Meyer  and
D. Mitchell
R. S. Hetem*
Affiliation:
Brain Function Research Group, School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa
B. A. de Witt
Affiliation:
Brain Function Research Group, School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa
L. G. Fick
Affiliation:
Brain Function Research Group, School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa
A. Fuller
Affiliation:
Brain Function Research Group, School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa
G. I. H. Kerley
Affiliation:
Department of Zoology, Centre for African Conservation Ecology, Nelson Mandela Metropolitan University, PO Box 77000, Port Elizabeth 6031, South Africa
S. K. Maloney
Affiliation:
Brain Function Research Group, School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa Physiology, School of Biomedical, Biomolecular, and Chemical Science, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia
L. C. R. Meyer
Affiliation:
Brain Function Research Group, School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa
D. Mitchell
Affiliation:
Brain Function Research Group, School of Physiology, University of the Witwatersrand Medical School, 7 York Road, Parktown 2193, South Africa
*
E-mail: [email protected]
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Abstract

Angora goats are known to be vulnerable to cold stress, especially after shearing, but their thermoregulatory responses to shearing have not been measured. We recorded activity, and abdominal and subcutaneous temperatures, for 10 days pre-shearing and post-shearing, in 10 Angora goats inhabiting the succulent thicket of the Eastern Cape, South Africa, in both March (late summer) and September (late winter). Within each season, environmental conditions were similar pre-shearing and post-shearing, but September was an average 5°C colder than March. Shearing resulted in a decreased mean (P < 0.0001), minimum (P < 0.0001) and maximum daily abdominal temperature (P < 0.0001). Paradoxically, the decrease in daily mean (P = 0.03) and maximum (P = 0.01) abdominal temperatures, from pre-shearing to post-shearing, was greater in March than in September. Daily amplitude of body temperature rhythm (P < 0.0001) and the maximum rate of abdominal temperature rise (P < 0.0001) increased from pre-shearing to post-shearing, resulting in an earlier diurnal peak in abdominal temperature (P = 0.001) post-shearing. These changes in amplitude, rate of abdominal temperature rise and time of diurnal peak in abdominal temperature suggest that the goats’ thermoregulatory system was more labile after shearing. Mean daily subcutaneous temperatures also decreased post-shearing (P < 0.0001), despite our index goat selecting more stable microclimates after shearing in March (P = 0.03). Following shearing, there was an increased difference between abdominal and subcutaneous temperatures (P < 0.0001) at night, suggesting that the goats used peripheral vasoconstriction to limit heat loss. In addition to these temperature changes, mean daily activity increased nearly two-fold after March shearing, but not September shearing. This increased activity after March shearing was likely the result of an increased foraging time, food intake and metabolic rate, as suggested by the increased water influx (P = 0.0008). Thus, Angora goats entered a heat conservation mode after shearing in both March and September. That the transition from the fleeced to the shorn state had greater thermoregulatory consequences in March than in September may provide a mechanistic explanation for Angora goats’ vulnerability to cold in summer.

Keywords

Angora goatsbody temperatureshearingfleece
Type
Full Paper
Information
animal , Volume 3 , Issue 7 , July 2009 , pp. 1025 - 1036
Copyright
Copyright © The Animal Consortium 2009

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