Progressive Changes in the Physiological Responses of Heat-stressed Broiler Chickens

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  • Mujahid Ahmad
    Science of Biological Function, Life Science, Graduate School of Agricultural Science, Tohoku University, Japan Present address: Laboratory of Advanced Animal and Marine Bioresources, Faculty of Agriculture, Kyushu University, Japan
  • Akiba Yukio
    Science of Biological Function, Life Science, Graduate School of Agricultural Science, Tohoku University, Japan
  • Toyomizu Masaaki
    Science of Biological Function, Life Science, Graduate School of Agricultural Science, Tohoku University, Japan

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The present experiment was designed to study progressive changes in the physiological responses of broiler chickens (Gallus gallus) exposed to different durations of acute heat stress. Male broiler chickens (n=8) at 16 days of age, were exposed to acute heat stress of 34°C for 6, 12 or 18h while control chickens were kept at 25°C. Exposure to different durations of heat stress resulted in significant decreases in the levels of blood HCO3- and pCO2, while pH and pO2 were not changed. Hemoglobin, hematocrit and Na+ values were reduced after 6h while no such change was observed after 12 or 18h of heat stress. In contrast, K+ levels were lowered by 6 or 12h of heat stress and no differences in blood calcium levels were observed between the control and heat-stressed groups. In conclusion, there is evidence that exposure of broiler chickens to different durations of acute heat stress resulted in distinct time-dependent physiological responses. Data set from this experimental model could provide an overview of physiological state in the typical acute heat-stressed birds.

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