The concept of a meat-type hog today is different than it was 10 years ago. Carcass qualities are improving right along. But there's still room for improving both the hogs and the methods for paying for them.
Rust, Robert E.
"What Is a Modern Meat-Type Hog?,"
Iowa Farm Science: Vol. 18
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol18/iss8/4