I found this from game & fish mag
Myth No. 8: Urinating near your stand will scare bucks away.
Debunked! 15 Deer Myths
Well, a buck might run if it sees any movement associated with your answering the call of nature, but the scent of urine itself isn’t going to have an effect. It’s a natural chemical signal out there in the animal world, and deer are no more alarmed by human urine than by that of does or raccoons. Several studies have involved placing human urine in scrapes, with observers noting that bucks didn’t spook when they returned to the site.
Certainly a human’s urine has a slightly different chemical makeup than a deer’s, but evidently it doesn’t contain any of the alarm signals that smells such as human perspiration or skin body odor contain.