THE HAGUE - A Dutch inventor is banking on a new bovine urinal to help cut emissions that cause environmental damage. Tests have started on a farm in the Netherlands on the device, which collects some of the 15 to 20 liters (4 to 5 gallons) of urine that the average cow produces a day. That produces huge amounts of ammonia in a country like the Netherlands, which is the world's second-biggest agricultural exporter, after the United States. "We are tackling the problem at the source," Henk Hanskamp, the Dutch inventor and businessman behind the "Cow Toilet," said Friday. "A cow is never going to be completely clean. The way the toilet works is "udderly" ingenious. The urinal is in a box placed behind the cow, while in front is a feeding trough. Once the animal finishes eating a robot arm stimulates a nerve near the udders, which then makes it want to urinate. The cow toilets are currently being tested on a farm near the eastern Dutch town of Doetinchem, and seven of its 58 cows have already learned how to use them without the need for stimulation. "The cows have got used to it," Hanskamp said. "They recognize the box, lift their tail and pee." "The stables have become cleaner and the ground is drier.