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Radioiodine in Milk of Cows Under Various Feeding and Management Systems

Animal Husbandry Research Division, U.S.D.A., Beltsville, Maryland

F. J. Burmann

Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio

C. L. Cole

Department of Dairy Husbandry, University of Minnesota, St. Paul

J. A. Sims

Department of Animal Science, Iowa State University, Ames

G. E. Stoddard

Department of Dairy Industry, Utah State University, Logan

ABSTRACT

Over a period of two months, iodine-131 was measured in milk from cows under various feeding and management systems in three different locations. Milk from cows on pasture contained iodine-131 concentrations as high as 710 picocurie (pc)/liter, whereas 60 pc/liter was the highest concentration reached by any of the cows on stored feed. The rate of decrease in radioiodine concentration of milk when the animals were removed from pasture to stored feed could be resolved into a two-component system with half-lives of approximately 18 hr and five days.