Abstract
The nature of thyroid iodine in the postnatal state is fairly well understood. At least 90 per cent of it is organic and almost all of this can be accounted for by two fractions: thyroxine-like and diiodotyrosine- like iodine.3 These two compounds do not exist in the free state in the gland but are combined there with other amino acids to form the characteristic thyroid protein, thyroglobulin. The nature of the iodine in the fetal organism has not been clearly established. To obtain such information, a study of various iodine fractions of the bovine fetal thyroid was undertaken. Data on that phase of the study will be presented in the following paper. The material acquired during these experiments also provided an opportunity for studying the growth of the gland in relation to body weight, body length, and age of the bovine fetus from 62 days to term (278–285 days depending upon breed).
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