In 1971-72 the first U.S. National Sire Summary was published by a beef cattle breed association. At that time the idea of extending beef performance records into a national progeny testing program was indeed revolutionary. Until 1972, truly accurate comparisons of bulls could only be made within a herd-year-season contemporary group. The first and subsequent National Sire Summaries compared bulls across herds and/or generations.
Number of Pages
South Dakota State University
Copyright © 1991
Benyshek, Larry, "Computations Associated with National Beef Cattle Evaluation Programs" (1991). South Dakota Beef Seedstock Symposium, 1991. 2.