I have run extensive tests on fresh pee vs aged pee and could never note one iota of difference in animal attraction. Urine is good for years if it is good clean strained urine to begin with so it doesn't get putrid/spoiled from food particles in it. When kept from season to season, urine should be kept in glass jugs and in a cool dark place. Plastic jugs are porous and the amonia content escapes through the pores over time and the uring begins to smell weak and flat. Even the flat urine still works but is not as strong and natural as if it were stored properly. Ace :grin:
