The largest of these, and the one producing the largest fraction of the seminal fluid, is the seminal vesicles. They consist of two lobes about 4 to 5 inches long each connected to the urethra by a duct. The other accessory gland in this region is the prostrategland , located at the neck of the urinary bladder where it empties into the urethra. The prostate is poorly developed in the bull and does not produce a very large volume of secretion