Deerhunter 515- to answer your question-
There are basically two categories of deer urine scent, deer urine with preservatives,companies that buy deer urine from deer farms around the countrye.g. Tinks , Code Blue etc...
Secondly, deer urine without preservatives from farms that own their own deere.g. Southern Whitetail Scent, Northern Whitetail Scents and Stonycreek whitetails etc.....
I have had very little success with the deer urines with preservatives- sometimes I wonder how old that stuff is, was it from two or three years ago? How do the companies that buy from multiple farms and mix the urine together ensure quality?
I started using freshly collected (from the current hunting year) deer urine products and in the last two years my boys and I have harvested some really nice bucks using products from Southern Whitetail Scents. I think the preservatives in the urine change the smell!
Check um out at www.southernwhitetailscentsi