Protein-Bound Iodine Levels of the Chick

In recent years, protein-bound iodine levels have been used as a measurement of thyroid activity. Normal values of protein-bound iodine have been reported for many animals, including man. Brown, Reingold and Samson (1952) reported a range of 3.5 to 7.0 micrograms percent for man. O’Neal and Heinbrecker (1953) reported an average value of 2.6 micrograms percent for dogs. Long et al. (1952) reported a range of 2.19 to 4.11 for several breeds of cattle. Gawienowski et al. (1955) reported a range of 1.52 to 5.4 micrograms percent for swine. Salter and McKay (1944) reported a level of 4.7 micrograms percent for the Rhesus monkey, and a value of 3.9 for the albino rat. Katsh and Windsor (1955) reported a mean value of 2.6 micrograms percent for 3 White Leghorn chickens. In the work to be reported here, the method of Brown, Reingold and Samson (1952) for determination of protein-bound iodine …