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Thyroid development in altricial ring doves, Streptopelia risoria.

F M McNabb, M F Cheng

    General and Comparative Endocrinology
    |May 1, 1985
    PubMed
    Summary
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    Thyroid function in young ring doves develops rapidly in the first eight days post-hatching, with thyroid hormone levels stabilizing by Day 15 to support maturation. This study tracked thyroid hormone concentrations and activity during development.

    Area of Science:

    • Avian physiology
    • Endocrinology
    • Developmental biology

    Background:

    • Thyroid hormones are crucial for development and metabolism in altricial birds.
    • Understanding thyroid development is key to comprehending nestling maturation and survival.

    Purpose of the Study:

    • To investigate the developmental trajectory of thyroid function in altricial ring doves.
    • To correlate thyroid hormone dynamics with key developmental milestones.

    Main Methods:

    • Measurement of serum thyroid hormone concentrations (T3, T4).
    • Assay of thyroid gland hormone content.
    • Determination of hepatic 5'-monodeiodinase activity.

    Main Results:

    • Thyroid function was low at hatching, increasing significantly in the first eight days.

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  • Serum hormone levels stabilized around Day 15, coinciding with maturing thermoregulation and self-sufficiency.
  • Serum T3/T4 ratios were higher than thyroidal ratios, indicating active deiodination.

    • Conclusions:

    • Thyroidal deiodination of thyroxine (T4) to triiodothyronine (T3) is vital for early development in ring doves.
    • Thyroid hormone development is tightly regulated and linked to the maturation of essential physiological and behavioral traits.