Mrs. Doe Pee's Doe in Estrus Passion is a true key to success. The "estrus" means that the there is a pheremone inside the urine, telling the bucks that this doe is ready to breed. If used during the pre-rut, you could send the bucks searching for the lone doe in heat, increasing your chances of taking the shot. If used during the rut, you could pull the buck in on the trail of a hot doe. If used duriong the post-rut, bucks might stay active looking for the one last doe to breed.