Equine hypothyroidism

Veterinary advice should be sought before applying any treatment or vaccine.

Equine Hypothyroidism

Underactive Thyroid, Low Thyroid, Hypothyreosis

Equine hypothyroidism is a endocrine condition which occurs in older horses, in which the thyroid gland does not produce enough thyroid hormone (TH). It is the result of diseases that affect thyroid function, exogenous compounds that reduce TH synthesis, and disorders of the hypothalamus or pituitary gland. Neoplasia is the most common cause of hypothyroidism in older horses.

The diagnosis can be a challenge since many variables can influence diagnostic test results. Horses treated with phenylbutazone and glucocorticoids can often be misdiagnosed as hypothyroid.

Symptoms

Lethargy
Laminitis
Decreased appetite
Low body temperature
Reduced heart rate
Reduced respiratory rate
Hair loss
Poor haircoat
Limb edema
Obesity
Reduced athletic performance
Anemia
Inability to sweat normally

Diagnosis

  • TRH-stimulation test

Treatment

Levothyroxine sodium : Administered in feed at a rate of 0.1 mg/kg/day

Prevention

Prognosis

Scientific Research

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