If they are already aware that there is corn in the field and they have been hitting it, that orange plastic fence would keep them out. They can jump it standing flat footed, You will be sweating for nothing. Once they find food they prefer it is almost impossible to keep them out without a high fence and for your purpose way too expensive.
When you are up to your butt in alligators, it is hard to remember your intent was to drain the swamp. Stay focused!