If you are hunting a well managed piece of property and you see mature bucks on a semi regular basis, and then you feed them. You will still see mature bucks on a semi regular basis. If you hunt a poorly managed property that is pressured where you rarely see a mature buck, and then you feed them corn, you will still rarely see a mature buck. Corn doesnt majically make big mature deer step out in the daylight hours. IMO corn or no corn has a very miniscule effect on whether or not you are going to kill a mature buck this year.