In 1979, the USDA implemented a new feeder cattle grading system that is distinctly different from the old, both in concept and terminology. Under the old grading system, the traditional grade categories of Prime, Choice, Good, and so on were used. Animals were graded according to their ability to satisfy a number of qualitative characteristics. The new system is based upon a dual criterion of framesize and muscling. Cattle are graded as either having large, medium, or small framesizes and No. 1, No. 2, or No. 3 muscling (thickness).
Casual observation of the two grading systems indicates that cattle graded as Choice under the old system will in most cases be classified as Medium Frame, No. 1 Muscled cattle under the new system. Likewise, cattle previously graded as Good will in most cases likely be graded as Medium Frame, No. 2 Muscled animals.