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Source of Iodine in Salt Affects Protein-bound Iodine Content of Bovine Blood Plasma¹

Dairy Department, Clemson College, Clemson, South Carolina

ABSTRACT

During June, 1958, to May, 1959, blood plasma samples of approximately 350 dairy calves, heifers, and cows in the College herd were analyzed for protein-bound iodine (PBI) by the Brown method, as modified by Lennon and Mixner (2). The PBI values ranged from 2 to 42 per 100 ml., with about 15% of the samples above 20, and 75% above 10 per 100 ml. Asplund et al. (1) of West Virginia have reported that levels of PBI from 15 to 30 per 100 ml. were common in their study, and values as high as 75 per 100 ml. were obtained. Both of the observations were distinctly higher than those found in other laboratories. In a search for an explanation of the high values, the iodine in the trace-mineralized salt was considered worthy of checking. Long et al. (3) found no effect when 22 mg. of potassium iodide were fed daily, but 44 mg. caused an increase in the PBI of dairy cows.

¹ Technical Contribution No. 318, South Carolina Agricultural Experiment Station, Clemson.