Abstract
Summary
Rat serum T4 levels were inversely correlated with lactational intensity, and the markedly reduced serum T4 observed in high-lactating rats could not be counteracted with 10 times the normal dietary iodine.
Exogenous ovine prolactin (2 mg/day for 15 days), when administered to nonlactating rats, had no effect on serum T4. It was concluded that high serum prolactin, associated with nursing, was not a factor directly contributing to the reduction of serum T4 observed during lactation.
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