After about a year it starts to lose enzymes.. Best way to know if it's still good is to taste it, if it's bitter you're good to go
Generally, without preservatives, it is pretty much done in 30-60 days if kept well. Left in a hot truck, etc., it will go MUCH faster, maybe a week. You can extend it to 90+ days with a preservative. Synthetics can be a good choice if you don't want the worries.
There is a school of thought that is has broken down and is worthless when it is purchased no matter how fresh the label says it is.
Been saying this for a long time. There is hundreds of gallons of pee in the woods. In my experience, deer seem to have a "so what " response to it. I just wish more scent companies would produce a quality pre-orbital scent. You don't have to use it by the ounces and works far better than pee. I'm sure it's a $$$ thing for scent companies.....deer urine is so readily available in volume but pre-orbital is not. Quantity over quality I guess.
Deer more often than not don't have a "so what" attitude to urine. Do they have a "so what" attitude to your sweat? Your sweat and urine contain many of the same compounds. So why do you spend money on odor eliminators if you are going to whiz off your stand? You have seen this in action as well with another animal: dogs. A dog will come up to you and smell your dog on you, sniffing away. Obviously, it knows another dog when it smells one. Watch the dog at a fire hydrant. Or when a ***** in heat is around. They KNOW what it is they are smelling. A dog can trail an individual person by his or her smell as well. They know who left that odor behind. Since deer have a little bit better sense of smell than a dog, they very likely can do the same things. I am sure I am not alone in seeing deer spook at fox urine used for cover scent. Or human urine for that matter. I suppose after awhile deer may get used to it and ignore it in areas with lots of people (I have seen deer follow farm tractors dumping food for cows). But I would not bet on that in most circumstances, especially in areas where human scent is uncommon. They absolutely know your wiz ain't deer wiz :D
Mammal urine is the same, deer or human. Seat glands? We have sudoriferous and sebaceous glands. Sudoriferous is sweat glands the other secretes waxy oily substances. I have watched bucks walk up to where I urinated and have no negative reaction, they just stop and check it out sometimes. I have also watched them make a scrape where I made my deposit. Even right under my tree while I was in the tree. Clean with odor eliminators. So I believe it is alright to let fly out of the tree. Does deer urine expire? Yes. But I keep mine in the refrigerator from one season to the next. When I go to use it the following season I open the bottle and let it breath for a few minutes. Works fine.
This is a very inaccurate statement. Starting just with 2-phenylethylamine, for example, meat eaters can have thousands of times more in their urine versus a herbivore. And prey animals have trace amine-associated receptors that are quite keyed in to this. There are others as well, but this is example enough to show that your wiz is NOT the same as deer wiz. Deer know the difference. Your sweat smells very different to them as does your body flora. Best reduce it as much as possible. Wiz in a bottle or hunting bladder.
OK, yes there are some chemical differences but all respect sir but can you explain why the bucks around here don't spook at my urine? Why they make scrapes where I let fly? Just trying to get an explanation. BTW, I hunt big timber areas (1.6+ million acres) as well as small private lands so some of those deer are not all that used to human contact.
