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Related Experiment Videos

Rapid decrease of the peripheral deiodination of thyroxine in malabsorption syndrome in artificially inoculated

P Rudas1, G Sályi, J Szabó

  • 1Department of Physiology, University of Veterinary Science, Budapest, Hungary.

Avian Diseases
|April 1, 1989
PubMed
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Thyroid function in broilers is impaired by malabsorption syndrome. Early inoculation with intestinal homogenate significantly reduced triiodothyronine and liver deiodinase activity, highlighting thyroid

Area of Science:

  • Avian medicine
  • Endocrinology
  • Poultry pathology

Background:

  • Malabsorption syndrome in broilers is a significant economic concern.
  • Thyroid hormones play a crucial role in growth and metabolism in poultry.
  • The specific mechanisms linking malabsorption syndrome to physiological dysfunction require further elucidation.

Purpose of the Study:

  • To investigate the impact of intestinal homogenate from malabsorption syndrome cases on broiler thyroid function.
  • To determine if a dose-response relationship exists between inoculum amount and thyroid function impairment.
  • To assess the early effects of inoculation on key thyroid hormone levels and enzyme activities.

Main Methods:

  • Broilers were inoculated with intestinal homogenate from field cases of malabsorption syndrome.

Related Experiment Videos

  • Different inoculum volumes were administered to evaluate dose-dependency.
  • Serum triiodothyronine levels and liver 5'-deiodinase (types I and II) activities were measured at 3 hours post-inoculation.

    • Main Results:

    • A significant decrease in serum triiodothyronine was observed as early as 3 hours post-inoculation.
    • Liver 5'-deiodinase (type I) activity was significantly reduced, indicating impaired thyroid hormone metabolism.
    • Type II deiodinase activity showed less impairment compared to type I.
    • A minimum of 0.3 ml inoculum was effective, with 0.05 ml also causing significant liver deiodinase reduction.

    Conclusions:

    • Thyroid function impairment is a critical component in the pathogenesis of broiler malabsorption syndrome.
    • Early and significant disruption of thyroid hormone levels and metabolism occurs post-inoculation.
    • These findings underscore the necessity of addressing thyroidal dysfunction in managing malabsorption syndrome in poultry.