According to The Pig Site from 5m Publishing, the urinary bladder of the pig is part of the animal's urinary tract system. The urinary system functions to remove toxins from a pig's blood and maintain the fluid levels in the body. Urine exits the bladder through the urethra of the pig.

The Pig Site explains the functioning of the urinary system by providing a quick overview of the process. Waste filtering in the urinary tract begins in the kidneys where toxic materials are initially extracted from the blood. The filtered residue is then transported with fluids into the pig's ureters before it is stored in the bladder and expelled as urine through the urethra.

According to The Pig Site, small stones in a pig's urine are called calculi, and an inflammation of the bladder's lining is referred to as cystitis. The mortality rate can be high among sows with this type of infection. The normal urine pH is somewhat acidic and falls on the scale at around 5 to 6.6 pH. If a pig has a pH higher than 7.5, this indicates that the animal is sick and the chance for mortality is high, especially if a pH of 8 is reached.