I guess it depends on where you're at
I've got coastal and wheat fields all over,, in addition to fresh growth...
went to check on my cams on sunday and noticed
my 600 lbs gravity feeder I filled 2 months ago is empty
cam had 5800 pics of 5 bucks and 2 does feeding several times daily
and staying a good 10-15 min each
one leaves another jump right in
maybe you have bad corn