SUMMARY A biometric study wrth ultrasound was done in thoroughbred foals from 2 to 24 month old. From 12 month was observed an increase in the testicular development. Also, a significam correlation was found between the ultrasound measure of the transversal testicular diameter (height) and age. The ultrasonographic image of the testicular parenchym was hypoechoic since 5-6 month. The reflexion rate increased u p to reach the adult pattern.
testis; ultrasound; biometric
