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Demonstrates significant reciprocal iodine exchange between mother and suckling rats, with the dam recovering a majority of iodine lost in milk.
Previous data have demonstrated that thyroid gland thyroxine secretion rate in suckling rats is high and correlated with the hormonal needs of the young. Non-hormonal iodine metabolism is more elevated in the young than in the adult. The object of the present work was to measure rates of iodine transfer in 10-day old families of rats equilibrated with 125I or not. Reciprocal iodine exchange between mother and young occurred in such a way that the dam recovered about 60 p. 100 of the iodine lost in the milk. Moreover, a large store of extrathyroidal iodine was constituted in the young, particularly in the pelt.
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Vigouroux et al. (1980) studied this question.
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