J. Anim Sci.
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J. Anim Sci. 1978. 46:320-327.
© 1978 American Society of Animal Science
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Effects of Dietary Potassium and Rumen Contents upon 40K Estimation of Body Composition in Dairy Cattle1

R. L. Belyea2, F. A. Martz2, R. D. Young2 and J. L. Clark3

University of Missouri-Columbia, Columbia 65201

Abstract

Two experiments were conducted with four fistulated heifers to determine effects of potassium intake upon estimation of rumen potassium, body potassium and body composition. Increasing potassium intake increased rumen potassium in both experiments but did not affect estimates of body potassium content or of body composition in either experiment. Evacuation of rumen contents decreased estimates of body K and body composition. Gut radioactivity appeared to be a major source of variation that must be controlled, although dietary K seemed to be of little importance.

Footnotes

1 Contribution from the Missouri Agricultural Experiment Station. Journal Series No. 7764. Approved by the Director. The authors are grateful to Joan Stauffer for secretarial support in typing this manu script.

2 Department of Dairy Husbandry.

3 Department of Animal Husbandry.






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Copyright © 1978 by the American Society of Animal Science.