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The Iodine Content of Milk as Affected by Feeding Iodized Dry Milk^*

The Dry Milk Company Research Laboratories, Bainbridge, N. Y.

L. T. Wilson

Walker-Gordon Laboratory Company, Inc., Plainsboro, New Jersey

ABSTRACT

A critical inspection of the data presented herein shows substantial- and consistent agreement in the trend of iodine recovery in the milk as affected by seasonal or environmental conditions. The data have been collected at stated intervals over a period of three years in four different states. The records as shown in the tables and graphs represent numerous iodine determinations on the composited milk from thousands of cows, as well as numerous iodine determinations on composite feed samples and individual constituents of the ration.

The percentage of iodine recovered in the milk at comparable periods is essentially of the same magnitude, irrespective of whether the iodine ingested is in such a form as that naturally occurring in ration constituents produced on high iodine soils, as in South Carolina, that naturally occurring in normal ration constituents grown in other areas, or that supplied in the form of iodized dry milk.

The output of iodine in the milk per cow per day does not parallel the iodine ingested, irrespective of the intake level or form in which it is ingested, insofar as the data presented herein indicate. Nevertheless, the iodine concentration, as well as the total iodine output of the milk, is distinctly influenced and increased when an organic iodide supplement such as iodized dry milk is fed. It appears that the lack of a parallel relationship between the total iodine output and the percentage recovery in the milk on the one hand, and iodine ingested on the other, may be due primarily to environmental conditions prevailing during the relatively warm and cold seasons of the year. A distinctly lower total output and lower percentage recovery was found in all territories covered by these studies during the warm months.

^* Presented at the 29th Annual Meeting of the American Dairy Science Association, Geneva, N. Y., June 28, 1934.