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Effects of acute heat stress on changes in the rate of liquid flow from the rumen and turnover of body water of swamp buffalo

Published online by Cambridge University Press:  27 March 2009

N. Chaiyabutr ,
C. Buranakarl ,
V. Muangcharoen ,
P. Loypetjra  and
A. Pichaicharnarong
N. Chaiyabutr
Affiliation:
Department of Physiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
C. Buranakarl
Affiliation:
Department of Physiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
V. Muangcharoen
Affiliation:
Department of Physiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
P. Loypetjra
Affiliation:
Department of Physiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
A. Pichaicharnarong
Affiliation:
Department of Physiology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
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Summary

During 5 h of acute heat exposure (41 °C), there were increases in the heart rate from 43±2 (S.E.) to 51 ± 1 beats/min, respiratory rate from 26±4 to 86± 16 breaths/min and rectal temperature from 38·5 ± 0·1 °C to 39·7 ± 0·2 °C. The flow rate of liquid from the rumen and body water turnover significantly increased while biological half life of chromium-51 ethylenediaminetetra-acetate in the rumen and tritiated water decreased from 12·9 ± 2·5 and 87·7 ± 6·8 h to 9·3 ± 2·0 and 49·2 ± 5·7 h respectively. An increase in blood volume during acute heat stress occurred with an increase of both plasma and cell volume. An elevation of plasma water coincided with an increase in plasma protein and glucose. There is evidence that the increase in plasma water during heat exposure came from extravascular tissue space and/or from the digestive tract.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 108 , Issue 3 , June 1987 , pp. 549 - 553
Copyright
Copyright © Cambridge University Press 1987

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