Thyroid hormone concentrations in black bears (Ursus americanus): hibernation and pregnancy effects.

@article{Tomasi1998ThyroidHC,
  title={Thyroid hormone concentrations in black bears (Ursus americanus): hibernation and pregnancy effects.},
  author={T E Tomasi and Eric C Hellgren and Thomas John Tucker},
  journal={General and comparative endocrinology},
  year={1998},
  volume={109 2},
  pages={
          192-9
        }
}
Previous studies on thyroid hormones in hibernating bears have used very few sampling periods, so that the time course of any change is poorly understood. In this study, plasma sampled from pregnant and nonpregnant black bears before and during hibernation (16 samples each at 10-day intervals) was assayed by radioimmunoassay for concentrations of thyroxine (T4) and triiodothyronine (T3). Only free T4 showed a difference (P = 0.019) between females that produced cubs and those that did not, but… CONTINUE READING

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