I have a system I use in Whitetail hunting during the rut that seems to work for me. When I make a mock scrape in the area I wish to hunt I will place a couple of 35mm film canisters (film removed of course) in the scrape after I have cleared out all leaves and other debris. The film canisters are filled with cotton balls and saturated with doe in heat urine. This keeps the urine from soaking in the ground and can be refreshed on each trip if needed.
I will also use the tarsal gland of the buck I have taken the previous year. Shortly after I remove the gland I will freeze it in a zip lock baggie until I need it the next fall. Take the frozen tarsal gland from the baggie and hang it above the mock scrape. After the hunt you can re-freeze the gland and reuse several times. One gland can last an entire season if the weather is cool.
The combination of the doe pee in the canisters and the tarsal gland above the scrape has been most effective during the rut. This is an economical way to attract the dominate buck in your area. He will think a strange buck is trying to breed a hot doe in his territory. Good Luck and Good Hunting!