Abstract: A method for growth promotion in animals consists in percutaneous application of an electromagnetic field having a frequency of from 25 to 150 MHz and a power of from 30 to 40 W, to the region of the epididymal lobules of the spermatic cords and the epididymides, said application of an electromagnetic field being carried until a subcutaneous induration appears in the aforesaid region, that is, within an exposure time of from 10 to 20 s.