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Thyroidal influence on body growth.

D B King, J D May

The Journal of Experimental Zoology

|December 1, 1984

Summary

This summary is machine-generated.

Thyroid hormones are crucial for poultry growth, impacting body weight, skeletal size, and muscle development. Supplementation is beneficial only in deficient cases, with excess proving detrimental.

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Area of Science:

Poultry Physiology
Endocrinology
Animal Growth and Development

Background:

Thyroid hormones play a significant role in regulating growth and metabolism in poultry.
Understanding thyroid influence is key to optimizing poultry production and health.

Purpose of the Study:

To review the influence of thyroid hormones on various growth parameters in poultry.
To analyze the effects of thyroid status on body weight, skeletal growth, muscle development, and cartilage/bone formation.

Main Methods:

Review of existing literature on thyroid function and poultry growth.
Analysis of studies involving goitrogens, thyroidectomy, and hormone supplementation.
Examination of effects on embryonic and posthatching growth, muscle parameters, and cartilage development.

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Main Results:

Thyroid deficiency significantly reduces posthatching growth, particularly body weight gain.
Thyroid hormone replacement normalizes growth in deficient birds; supplementation in normal birds shows no benefit.
Excessive thyroid hormone (T3) negatively impacts growth and feed efficiency.
Thyroid hormones stimulate muscle growth and cartilage development, with T3 enhancing somatomedin action.

Conclusions:

Thyroid hormones are essential regulators of poultry growth, influencing multiple physiological parameters.
Optimal thyroid function is critical for maximizing poultry growth and development.
Further research is needed on posthatching cartilage and bone growth regulation by thyroid hormones.