J. Anim Sci.
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J. Anim Sci. 1972. 34:64-69.
© 1972 American Society of Animal Science
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Effect of Constant Ambient Temperatures of 10 C and 31 C on Ruminal Responses of Cold Tolerant and Heat Tolerant Cattle1

S. E. Olbrich2, F. A. Martz2, H. D. Johnson2, S. W. Phillips2, A. C. Lippincott2 and E. S. Hilderbrand3

University of Missouri, Columbia 65201

Abstract

Three Scotch Highland and three Zebu heifers, 18 months of age, were subjected to ambient temperature-relative humidity (RH) treatments, 2 weeks each, of 10 C-50% RH and 31 C-5O% RH.

Respiration rates and rectal temperatures increased significantly for both breeds at 31 C, with the increase being much greater for the Scotch Highlands.

Total ruminal volatile fatty acid (VFA) concentration, mEq/liter, significantly decreased for both breeds at 31 C. This may have been the result of a significant decrease in feed consumption and increase in water consumption for both breeds at the higher temperature.

The Scotch Highlands had significantly greater total ruminal VFA concentration than the Zebus at 10 C. At this temperature there was no breed difference in feed consumption, although the Scotch Highlands drank significantly more water.

There was no significant difference in total ruminal VFA concentration between the two breeds at 31 C, even though the Scotch Highlands drank significantly more water and consumed significantly less feed than the Zebus at this temperature.

Footnotes

1 Contribution from the Missouri Agricultural Experiment Station, Journal Series No. 7078. Approved by the Director.

2 Department of Dairy Husbandry.

3 Missouri Agricultural Experiment Station.






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