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The respiratory activity of calves subjected to thermal stress

, : The respiratory activity of calves subjected to thermal stress. Journal of Physiology 136(2): 300-309

The pneumotacho-grams of calves at normal temperatures are similar to those of dogs. The pneumotachograms of calves in thermal polypnea are similar to those of dogs after exercise. The mean asymptotic values for 10 calves subjected to 20[degree], 30[degree] and 40[degree]C environmental temperatures were: respiratory frequency, 70, 120 and 145/minute; minute volume 44, 62 and about 80 l/minute; and tidal volume, 0.66, 0.52 1 for 20[degree] and 30[degree]C only. Of the 10 animals used in these experiments, 3 were heat-tolerant as determined by the slowness of rise of their rectal temperature with increasing thermal stress. These animals showed large increases in respiratory frequency, large decreases in tidal volume and little change in minute volume with increasing thermal stress. With the heat-intolerant calves, large increases in frequency occurred, and little change in tidal volume and large increases in minute volume were apparent with increasing thermal stress.


PMID: 13429488

DOI: 10.1113/jphysiol.1957.sp005761

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