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Animal Growth Hormones
- Control of Growth & Development

As mentioned in previous pages of the tutorial, hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most important in regards to control and development.

Somatotrophin - Growth Hormone

The pituitary gland is responsible for the production of a hormone called somatotrophin. Somatotrophin is essential in the fact that it promotes mass production of proteins on a body-wide scale, by accelerating the rate of transport of amino acids; the constituents of a protein.

Thyroid Stimulating Hormone

The same part of the pituitary gland is responsible for thyroid stimulating hormone, or TSH for short. This targets the thyroid gland, also a member of the endocrine system, which in turn promotes the production of thyroxine


Thyroxine is responsible for controlling the body's metabolic rate, and therefore responsible for the amount of energy consumed and the volume of proteins produced.

Growth Extremes

The over production of somatotrophin can cause gigantism while under production can result in dwarfism. If the substance is over produced during adulthood, the person grows overly big jaws, hands and feet, a condition known as acromegaly.

The next page investigates hormones in plants...

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