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Uptake and Excretion of Cesium¹³⁴ and Potassium⁴² in Lactating Dairy Cows¹

University of Tennessee—Atomic Energy Commission, Agricultural Research Laboratory, Oak Ridge and Dairy Department, University of Tennessee, Knoxville, Tennessee

ABSTRACT

Eight lactating dairy cows were each given 1 mc. of Cs¹³⁴ and 6 mc. of K⁴² in a single oral dose. An average of 6.7% of the Cs¹³⁴ and 4.2% of the K⁴² were secreted into milk in 66 hr. Corresponding values for urinary excretion were 19.0 and 38.0%. Averages of 10.5, 30.0, and 32.7% of the cesium¹³⁴ were found in milk, urine, and feces, respectively, in 210 hr. The variation in Cs¹³⁴ and K¹² secreted into milk can largely be explained on the basis of differing milk yields, with concentration remaining somewhat constant. The concentration of Cs¹³⁴ and K⁴² in urine and the volume of urine are both highly variable.

¹ This manuscript is published with the permission of the Director of the Tennessee Agricultural Experiment Station, Knoxville. This work was completed under Contract No. AT-40-1-GEN-242 between the University of Tennessee College of Agriculture and the Atomic Energy Commission. The radioactive materials used were obtained from the Oak Ridge National Laboratory, on allocation from the United States Atomic Energy Commission.