Effect of environmental heat and dietary fiber on thyroid physiology of lactating cows.

@article{Magdub1982EffectOE,
  title={Effect of environmental heat and dietary fiber on thyroid physiology of lactating cows.},
  author={A Magdub and Howard D. Johnson and Ronald L. Belyea},
  journal={Journal of dairy science},
  year={1982},
  volume={65 12},
  pages={2323-31}
}
Six lactating dairy cows were assigned randomly to a diet either of low fiber (30% corn silage) or of high fiber (70% corn silage). Both groups were subjected to 10 days thermoneutral (17.6 degrees C) and 10 days of environmental heat (31.2 degrees C) to determine effects of dietary fiber content and environmental heat on concentrations of thyroxine and triiodothyronine in plasma, milk, urine, and feces. During heat there were significant reductions in concentrations of thyroxine and… CONTINUE READING

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