J. Anim Sci.
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J. Anim Sci. 1969. 29:734-737.
© 1969 American Society of Animal Science
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Effects of Environmental Temperature, Controlled Feeding and Fasting on Rumen Motility1

John T. Attebery and Harold D. Johnson2

University of Missouri, Columbia

Abstract

Rumen motility studies were conducted on five Holstein cows which were fed at a controlled level and exposed to various environmental temperatures of 2- and 5-day periods. A significant (P<.01) decrease was noted in the amplitude of the rumen contractions when the animals were exposed to 38° C. for 5 days. The removal of the rumen contents and fasting for approximately 20 hr. resulted in a significant (P<.01) decrease in both the frequency and amplitude of rumen contractions at all treatment temperatures. A high environmental temperature (38° C.) depresses rumen activity directly rather than indirectly via feed intake.

Footnotes

1 Contribution from the Mo. Agr. Exp. Sta. Journal Series No. 5358. Approved by the Director.

2 Dairy Husbandry Department.






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Copyright © 1969 by the American Society of Animal Science.