Body temperature of acclimated broilers during exposure to high temperature

Short-term acclimation to high temperatures increased resistance of broilers to heat exposure. Two trials were conducted to determined the effect of acclimation on body temperature (Tb) during heat exposure. Broilers, 46-days old, were maintained at control or acclimating temperatures for 4 days. Th...

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Bibliographic Details
Published in:Poultry science 1987-02, Vol.66 (2), p.378-380
Main Authors: May, J.D, Deaton, J.W, Branton, S.L
Format: Article
Language:English
Subjects:
Acclimatization
ADAPTACION FISIOLOGICA
ADAPTATION
Animals
BODY TEMPERATURE
BROILER CHICKENS
Chickens - physiology
ENVIRONMENTAL TEMPERATURE
Hot Temperature
Male
MORTALIDAD
MORTALITE
MORTALITY
POLLO DE ENGORDE
POULET DE CHAIR
RESISTANCE A LA TEMPERATURE
RESISTENCIA A LA TEMPERATURA
TEMPERATURA DEL CUERPO
TEMPERATURA DEL MEDIO AMBIENTE
TEMPERATURE AMBIANTE
TEMPERATURE CORPORELLE
TEMPERATURE RESISTANCE
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Summary:Short-term acclimation to high temperatures increased resistance of broilers to heat exposure. Two trials were conducted to determined the effect of acclimation on body temperature (Tb) during heat exposure. Broilers, 46-days old, were maintained at control or acclimating temperatures for 4 days. The control temperature was a constant 21 C with a 10 C dewpoint, and the acclimating temperature was a diurnal cycle of 24-35-24 C with a constant 21 C dewpoint. During the 4th day, broilers of both groups were exposed to temperatures of 41 C and 23 C dewpoint for 210 min. Body temperature was determined at the beginning of the heat exposure and at 30-min intervals until the end of the exposure. The Tb of both groups increased throughout heat exposure, but acclimated broilers had significantly lower Tb than control broilers from 90 through 210 min. Acclimated broilers had significantly lower heat stress mortality. The data show that acclimated broiler's Tb rises upon exposure to heat but that acclimation gives the capacity to stabilize Tb above normal Tb. The data also suggest Tb is preferable to mortality as a measure of acclimation in broilers.
ISSN:0032-5791
1525-3171
DOI:10.3382/ps.0660378