The Evaluation of Thyroid Gland Volume in the Foals by Ultrasonography

Ultrasonography of the thyroid gland is a non-invasive method for evaluating its size, which can be used to examine the initial increase in the volume of the gland in live foals. In this study, it is tried to be a standard method for measuring the extent of the thyroid gland using ultrasonography to obtain. For this purpose, 14 Kurdish foals were selected which the age of those was between 2 and 90 days. In each of the foals, the size of the thyroid gland was measured with ultrasonographic method of three standardized axes and the volume of the thyroid gland using a formula that is defined for the oval was calculated (VSON). Variability of sonographic measurements was dependent on side and axis, and ranged between 3.04-7.35 percent. The relationship between body weight and thyroid volume was significant. Generally, the thyroid size of the foals can be calculated by evaluating ultrasonography in three axes and comparing with predicted values based on body weight.