Everyday in the fall as I drive to work, I pass a farm that has a large valley. Everyday there is at least 4 or 5 deer eating in the morning within 100 yards of cows. You will still see deer. Yesterday there was a post on here from a gentleman who said he saw a buck while hunting that same kind of situation but as he tried to use his grunt call the deer just kept looking at the cows. I don't think it will stop them from coming in but you'll have to find out what kind of calls or scents might work