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Comparative thyroid development in precocial Japanese quail and altricial ring doves
The Journal of Experimental Zoology. Supplement : Published Under Auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry
|January 1, 1987
Summary
Thyroid development differs between Japanese quail and Ring doves, with distinct timing for hormone level increases. These findings highlight the roles of thyroid gland activity and hormone conversion in avian development.
Area of Science:
- Comparative endocrinology
- Avian development
- Thyroid hormone regulation
Background:
- Thyroid development is crucial for avian growth and metabolism.
- Understanding species-specific thyroid hormone dynamics is essential for developmental biology.
Purpose of the Study:
- To compare thyroid development patterns in precocial Japanese quail and altricial Ring doves.
- To elucidate the distinct phases of thyroid hormone regulation in these species.
Main Methods:
- Comparative analysis of thyroid gland development and circulating thyroid hormone levels.
- Examination of the transition between early and late phases of thyroid activity.
Main Results:
- Japanese quail exhibit an abrupt transition to high thyroid hormone levels post-hatching.
- Ring doves show a gradual increase in thyroid hormones over the first 6-8 days post-hatching.
- Both species demonstrate two phases of thyroid development: increasing gland capacity followed by elevated peripheral hormone activity.
Conclusions:
- Thyroid development timing and hormone regulation vary significantly between Japanese quail and Ring doves.
- Peripheral deiodination plays a key role in modulating thyroid hormone availability for tissue growth and metabolism in developing birds.