Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-03T04:59:08.324Z Has data issue: false hasContentIssue false
  • English
  • Français

The effect of environmental temperature and humidity on the frequency of the heart beat of Ayrshire calves

Published online by Cambridge University Press:  27 March 2009

W. R. Beakley  and
J. D. Findlay
W. R. Beakley
Affiliation:
The Hannah Dairy Research Institute, Kirkhill, Ayr
J. D. Findlay
Affiliation:
The Hannah Dairy Research Institute, Kirkhill, Ayr
Get access Rights & Permissions [Opens in a new window]

Extract

1. The heart rates of 4-month-old Ayrshire bull calves were measured in individual 6 hr. daily exposures to 15, 20, 25, 30, 35 and 40° C. dry bulb temperatures at 17 mg./l. absolute humidity and at 7 mg./l. saturation deficit at temperatures 30–40° C. The schedule of experiments on each animal lasted 45 days and consisted of five replications of these nine environmental conditions. Throughout the experimental schedule the heart rates of three paired control animals were measured in a temperature-controlled holding room.

2. The heart rates of all experimental animals increased with increasing environmental temperatures above 20° C. and with increasing humidity above 30° C.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 45 , Issue 4 , April 1955 , pp. 461 - 468
Copyright
Copyright © Cambridge University Press 1955

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Beakley, W. R. (1953). Studies in the Interchange of Heat between the Bovine and its Environment. Thesis, Univ. Glasgow.Google Scholar
Beakley, W. R. & Findlay, J. D. (1948). J. Physiol. 108, 12P.Google Scholar
Beakley, W. R. & Findlay, J. D. (1955 a). J. Agric. Sci. 45, 339.Google Scholar
Beakley, W. R. & Findlay, J. D. (1955 b). J. Agric. Sci. 45, 353.Google Scholar
Beakley, W. R. & Findlay, J. D. (1955 c). J. Agric. Sci. 45, 365.Google Scholar
Beakley, W. R. & Findlay, J. D. (1955 d). J. Agric. Sci. 45, 373.Google Scholar
Beakley, W. R. & Findlay, J. D. (1955 e). J. Agric. Sci. 45, 452.Google Scholar
Best, C. H. & Taylor, M. D. (1950). The Physiological Basis of Medical Practice, p. 242. London: Baillière, Tindall and Cox.Google Scholar
Blaxter, K. L. (1943). Vet. J. 99, 2.Google Scholar
Blaxter, K. L. & Price, H. (1945). Vet. J. 101, 39.Google Scholar
Findlay, J. D. (1950). Bull. Hannah Dairy Res. Inst. no. 9.Google Scholar
Findlay, J. D. (1954). Meteorological Monograph (U.S.A.), no. 8.Google Scholar
Kibler, H. H. & Brody, S. (1949). Res. Bull. Mo. Agric. Exp. Sta. no. 450.Google Scholar
Kibler, H. H. & Brody, S. (1950). Res. Bull. Mo. Agric. Exp. Sta. no. 464.Google Scholar
Kibler, H. H. & Brody, S. (1951). Res. Bull. Mo. Agric. Exp. Sta. no. 473.Google Scholar
Kibler, H. H. & Brody, S. (1953). Res. Bull. Mo. Agric. Exp. Sta. no. 522.Google Scholar
Kibler, H. H., Brody, S. & Worstell, D. M. (1949). Res. Bull. Mo. Agric. Exp. Sta. no. 435.Google Scholar
Newburgh, L. H. (1949). Physiology of Heat Regulation and the Science of Clothing, p. 268. London: W. B. Saunders Co.Google Scholar
Rieck, R. E. & Lee, D. H. K. (1948). J. Dairy Res. 25, 227.Google Scholar
Winslow, C. -E. A. & Herrington, L. P. (1949). Temperature and Human Life, p. 173. New Jersey U.S.A.: Princeton Univ. Press.Google Scholar
Worstell, D. M. & Brody, S. (1953). Res. Bull. Mo. Agric. Exp. Sta. no. 515.Google Scholar