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Effects of Feeding Practices on Cs¹³⁷ Levels of Milk^1,2,

Department of Animal Science, Colorado State University, Fort Collins

ABSTRACT

The levels of fallout Cs¹³⁷ have been determined in samples of forages and a grain mix fed to the University herd during 1962 to 1964. The highest levels were found in pasture forage over short periods of time following contamination by rains of high activity. Maximum pasture activity was found in June, with rather consistent declines until the end of the pasture season. Maxima were in 1962, 5,200; 1963, 6,800; and 1964, 4,100 pc/kg of dry matter. Nearly as much activity was found in first-cutting hay with a fourfold decrease in third-cutting hay. Corn silage had Cs¹³⁷ activities which were slightly higher than third-cutting hay, whereas grain mixes were considerably lower than third-cutting hay.

Milk from cows fed solely on pasture is a reliable indicator of variations in the fallout rate of Cs¹³⁷. However, under the more common dairy feeding practices, where cows are not entirely on pastures, milk levels are not closely related to fallout rates, even in the summer months.

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. 976.

³ U. S. Public Health Service officer.