L Kilkenny, remember that there is a time-aspect to this. In your area, the deer are into the corn when it's first heading out, and then on through the growing season and then into spillage from the harvest. That's a lot longer period to build up weight ahead of winter and the rut than where the corn is started maybe a week before season opens.
The food available during summer and fall is what builds deer up ahead of winter and the rut. In ranching country, the only really viable answer is range improvement with the natural growies.
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