The Laplanders, who use trained reindeer extensively to pull sleighs, use a measurement called poronkusema which loosely translates into "reindeer piss". This is because a reindeer cannot urinate when it is pulling a sled and is prone to urinary tract clogging if it is not allowed to urinate with regularity. A poronkusema is generally 10 to 15 kilometers or about 30 minutes of riding.