I'm not a deer biologist. But from what I have always been told .That as soon as a buck sheds his velvet,the testosterone level increases and he's ready to breed. He just has to wait for the ladies. I'd also have to agree that I don't think,with a deers curious nature when smelling somethin. That if he smells any deer urine he may check it out. Can he tell the difference if a does in heat,yes.Theres a higher estrogen level that sends them into a frenzy. The other thing is in my opinion,the claims made by some of these pee companies is how much of it is legitimate doe in estrus?