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Influence of Grazing Intensity on Radiostrontium Concentrations in Milk

U.S. Department of Health, Education, and Welfare, Cincinnati, Ohio

George F. Fries²

U.S. Department of Agriculture, Beltsville, Maryland

Melvin J. Anderson and George E. Stoddard

Department of Dairy Industry, Utah State University, Logan

ABSTRACT

The effect of grazing intensity on radio-strontium concentrations in milk was studied by comparing milk of two groups of Holstein cows grazed rotationally. One group was included in the main herd, on a normal rotational grazing system, and the other group followed the main herd one plot behind. Milk samples from the group following the main herd showed a significant increase at the 1% level in strontium-90 units and strontium-89 units. A significant, positive linear correlation for S.U. 90 and S.U. 89 in milk between the groups was obtained.

During the experimental period, a herd of Holstein cattle without access to pasture, consuming a weighed amount of feed, secreted 1.5% of their total strontium-90 intake into the milk.

¹ Division of Radiological Health, Public Health Service, Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio.

² Animal Husbandry Research Division, Agricultural Research Service, Beltsville, Maryland.