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Effect of Season on Secretion of Iodine in Milk^{1, 2, 3,}

University of Tennessee AEC Agricultural Research Program, Oak Ridge and Dairy Department, Knoxville

ABSTRACT

A significant effect of season on the metabolism of iodine by the dairy cow was demonstrated, using I¹³¹ in single doses and in a continuous daily dosing study. With these techniques it was determined that there is a stimulus that coincides with the onset of spring which causes the blood and milk levels of iodine¹³¹ to increase. The mammary gland also exhibited a marked tendency to concentrate iodine in the milk with the onset of the seasonal effect.

¹ This manuscript is published with the permission of the Director of the University of Tennessee Agricultural Experiment Station, Knoxville, Tenn.

² The radioactive materials used in this work were obtained from the Oak Ridge National Laboratory on allocation from the United States Atomic Energy Commission.

³ 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.

⁴ Present Address: Department of Chemistry, University of Tennessee, Memphis, Tenn.

⁵ Present address: Atomic Energy Project, University of California, West Los Angeles, Calif.