Abstract
Nine, 20- to 23-week-old, unrestrained male Athens Randombred chickens were exposed to a single step increase in ambient temperature from 26.7 to 43.3°C. for 80 to 90 minutes. ECG, respiration and body temperature were recorded using a radio telemetry system which is described. A digital counter for calibrating temperature transmitters or counting heart rate or rates of pulses up to 20 Hz. is described.Respiration rate and body temperature increased significantly with heating at body temperatures of 43 to 43.7°C. There was no significant change in heart rate.Amplitude of the T and P waves increased significantly at body temperatures of 43.4 to 44.1°C. Amplitude of the RS complex did not increase significantly.Heating caused an increase in the T wave interval, a decrease in the S-T and the P-R segments, and fusing of the P wave with the T wave. The normal ECG is also described.
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