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Maternal dietary iodide influences turkey embryonic thyroid function.

V L Christensen1, G S Davis

  • 1Department of Poultry Science, College of Agriculture and Life Sciences, North Carolina State University, Raleigh 27695-7608, USA. vern_christensen@ncsu.edu

Poultry Science
|September 18, 2001
PubMed
Summary
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Maternal thyroid hormone levels impact turkey embryo development. Supplementing iodide in breeder hen diets altered thyroid hormone (T4 and T3) levels, affecting embryonic thyroid function and hatching timing.

Area of Science:

  • Animal Science
  • Endocrinology
  • Reproductive Biology

Background:

  • Maternal thyroid hormones are crucial for embryonic development.
  • Understanding the maternal-embryonic thyroid axis in poultry is vital for optimizing hatchability and chick quality.
  • Thyroid hormone manipulation in breeder hens can influence offspring development.

Purpose of the Study:

  • To investigate the effects of maternal dietary iodide on thyroid hormone concentrations in turkey breeder hens and their embryos.
  • To determine if maternal thyroid hormone levels influence embryonic thyroid function and hatching characteristics.
  • To elucidate the maternal-embryonic thyroid hormone relationship in turkeys.

Main Methods:

  • Commercial turkey breeder hens were fed diets supplemented with iodide during their egg production cycle.

Related Experiment Videos

  • Maternal and embryonic blood samples were collected at various time points for thyroxine (T4) and triiodothyronine (T3) analysis.
  • Hatching patterns, including pipping times, were monitored in eggs from treated and control groups.

    • Main Results:

    • Dietary iodide supplementation reduced maternal blood thyroxine (T4) and triiodothyronine (T3) concentrations.
    • Embryonic T4 levels increased, while T3 levels showed transient decreases in response to maternal iodide treatment.
    • Iodide treatment accelerated the increase in embryonic T4 and led to earlier pipping in turkey embryos.

    Conclusions:

    • Embryonic thyroid function during hatching is significantly influenced by maternal thyroid status in turkeys.
    • Maternal thyroid hormone manipulation via dietary iodide can alter embryonic development and hatching dynamics.
    • The study highlights the dependence of embryonic thyroid development on the maternal environment, even in an extra-embryonic context.