Corn is traditionally priced on the basis of U.S. No. 2 grade. However, with the release of CCC-owned corn stocks for Emergency Assistance Programs, there is an increase in corn being marketed as No. 4, No. 5 or Sample grade. It is important for producers to understand corn grading standards and the feeding values of these grades.
Bitzer, Morris J. and Riddell, Dan O., "Corn Grades and Feed Value" (1984). Agriculture and Natural Resources Publications. 35.