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The effects of different iodide availabilities on thyroid function during development in Japanese quail
1Department of Biology, Virginia Polytechnic Institute, Blacksburg 24061.
Domestic Animal Endocrinology
|April 1, 1990
Summary
Japanese quail effectively regulate thyroid function despite varying iodide (I) intake. This adaptability in thyroid hormone synthesis maintains stable circulating levels, crucial for development.
Area of Science:
- Comparative physiology
- Endocrinology
- Avian biology
Background:
- Iodide (I) is essential for thyroid hormone synthesis.
- Thyroid hormones regulate metabolism and development.
- Understanding iodide's role in avian development is crucial.
Purpose of the Study:
- To investigate the impact of different dietary iodide availabilities on Japanese quail thyroid function during development.
- To assess how varying iodide levels affect thyroid hormone synthesis, metabolism, and gland response.
Main Methods:
- Japanese quail were fed low, control, or high iodide diets.
- Measurements included thyroid gland iodide and hormone content, plasma hormone levels, hepatic 5'-deiodinase activity, and TSH response.
- Studies were conducted on embryos and post-hatch chicks.
Main Results:
- High iodide intake elevated thyroidal iodide but did not alter thyroid hormones or TSH response, though it reduced body weight.
- Low iodide intake reduced thyroidal iodide and thyroxine (T4) but maintained triiodothyronine (T3) levels.
- Thyroid function and development remained largely unaffected across a wide range of iodide availabilities.
Conclusions:
- Developing Japanese quail demonstrate robust thyroidal regulation of iodide uptake and hormone synthesis.
- This regulation maintains stable circulating thyroid hormone concentrations despite dietary iodide fluctuations.
- Adaptation primarily occurs at the thyroid hormone synthesis level within the thyroid gland.