Dual grading of beef carcasses concerns both quality and amount fo edible meat. The system is aimed to result in slaughter cattle prices that encourage the production of meat-type carcasses. Here's what it's all about.
Rust, Robert E.
"A Look at Dual Beef Grading,"
Iowa Farm Science: Vol. 17
, Article 8.
Available at: https://lib.dr.iastate.edu/farmscience/vol17/iss2/8