HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Stewart, H. F. Articles by Johnson, J. E. Search for Related Content PubMed PubMed Citation Articles by Stewart, H. F. Articles by Johnson, J. E.

Availability of Fallout Cs¹³⁷ to Dairy Cattle from Different Types of Feed^{1, 2,}

Department of Animal Science, Colorado State University, Fort Collins

ABSTRACT

The metabolism of fallout Cs¹³⁷ contained in dairy cattle feeds was studied with high-producing dairy cows.

The transfer coefficient (Cs¹³⁷ secreted daily per liter of milk as a percentage of total daily Cs¹³⁷ intake) for individual cows ranged from 0.25 to 0.72 and was found to be closely related to the crude fiber content of the diet. The correlation coefficient between transfer coefficient and crude fiber intake for five cows was –0.66.

The average percentage of dietary Cs¹³⁷ found in the milk, urine, and feces of three cows was 7.4, 13.5, and 81.5. Reports from the literature utilizing tracer doses of radioactive cesium have found about 1.0% of the dose per liter of milk and approximately equal amounts excreted in urine and feces. The results reported here suggest that fallout Cs¹³⁷ in dairy cattle feeds is considerably less available than suggested by studies with tracers.

¹ This work was supported by contract AT(11-1)-1171 with the U.S. Atomic Energy Commission.

² Published with the approval of the Director of the Colorado Agricultural Experiment Station as Scientific Series Paper No. 995.

³ X-Ray Exposure Control Lab, 300 N. Stonestreet Avenue, Rockville, Maryland.