Is maternal thyroid hormone deposition subject to a trade-off between self and egg because of iodine? An experimental study in rock pigeon

We investigated whether low dietary iodine may limit Thyroid hormones production and transfer to the eggs in a captive population of Rock pigeons



Scholarcy highlights

  • Circulating iodine and Thyroid hormones concentrations In line with our expectations, there was a clear effect of iodine treatment on circulating iodine concentrations: serum iodine was about 75% lower in the I− group than in the I+ group
  • In this study we tested whether dietary iodine limits the mother’s circulating TH concentration, TH transfer to the yolk and egg production
  • Our study is the first to investigate the potential trade-off between circulating and yolk THs induced by low dietary iodine
  • We found that fewer females laid first clutches under the iodine-restricted diet compared with those under the iodine-supplemented diet, resulting in a lower total number of eggs laid
  • Effect of exposure duration and clutch order in this dataset, yolk iodine concentration was 87% lower in eggs of I− treated females than in those of I+ females, but longer exposure duration, clutch completeness or clutch order had no clear effect on yolk iodine concentration
  • We observed a slight increase in plasma T4 and in yolk T3 across time that was unrelated to the dietary iodine and is probably explained by seasonal changes or clutch order effects
  • One potential explanation is that, in our study, we could only sample the females that laid eggs and apparently managed to maintain normal circulating Thyroid hormones despite restricted iodine whereas those that did not lay eggs may have suffered from low circulating TH concentrations

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