Abstract
IN an attempt to find whether various degrees of tolerance to severe heat in cattle are associated with significant changes in respiratory minute volume, the following experiment was conducted. Each of 8 Ayrshire bull calves, aged 7–11 months, was exposed 3 times in a climatic room1 to an atmosphere of 40° C. dry bulb and 38° C. wet bulb temperature, until its rectal temperature reached 42.0° C. Every 10 min., throughout exposure, the volume and frequency of respiration were determined with a pneumotachometer2 and the rectal temperatures measured with thermocouples3. Heat tolerance was expressed in terms of rate of rise of rectal temperature (°C./hr.).
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References
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BLANCA, W. Tolerance to Severe Heat and the Behaviour of Respiratory Minute Volume in Cattle. Nature 195, 1208–1209 (1962). https://doi.org/10.1038/1951208a0
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DOI: https://doi.org/10.1038/1951208a0
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