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Influence of sudden temperature changes on oxygen consumption and heart rate in chickens in light and dark environments

Published online by Cambridge University Press:  27 March 2009

M. Van Kampen ,
B. W. Mitchell  and
H. S. Siegel
M. Van Kampen
Affiliation:
Department of Physiology and Pharmacology, College of Veterinary Medicine, Athena, Georgia, U.S.A.
B. W. Mitchell
Affiliation:
Southeast Poultry Research Laboratory SEA, 934 College Station Road, Athens, Georgia 30601, U.S.A.
H. S. Siegel
Affiliation:
Southeast Poultry Research Laboratory SEA, 934 College Station Road, Athens, Georgia 30601, U.S.A.
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Summary

Seven-week-old White Rock males were exposed to step-wise increases in ambient temperatures from 7·7 to 37·7 °C in light and dark environments. Heart rate decreased with increasing ambient temperature with a quadratic slope (P ≤ 0·0001). Heart rate was lower during the dark period than during the light period (P ≤ 0·06). There was a positive linear correlation between heart rate and oxygen consumption (γ = 0·997) for ambient temperatures from 7·7 to 37·7 °C.

Body temperatures began to increase significantly when ambient temperature reached beyond 27·5 °C. The increases followed a quadratic slope (P ≤ 0·0001). Body temperatures during the light period were significantly higher than during the dark period (P ≤ 0·05).

Type
Research Article
Information
The Journal of Agricultural Science , Volume 90 , Issue 3 , June 1978 , pp. 605 - 609
Copyright
Copyright © Cambridge University Press 1978

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