Image Number 2 for United States Patent #4564024.
An electro-ejaculator probe is inserted into the rectum of a restrained bovine bull. Electrical current is passed from electrodes located on the probe primarily to the nerves controlling erection and ejaculation. As little as possible, current is passed to the nerves registering pain. Electrical stimulation of these nerves results in ejaculation. Voids or pockets in the probe receive any fecal matter which might otherwise insulate the electrodes from the intestine wall. The ejaculated semen is collected for analysis or artificial insemination.