Ranking the top sires of AI sons and the top herds contributing sons to the AI industry was begun by Larry Specht in the mid-1970s, explains Chad Dechow, associate professor of dairy cattle genetics at Penn State University. Known as the Specht Report, the tool’s value continues today to help you identify elite cows, bulls and breeders.

You can use the three reports (Sire-Son, Prefix, Bull-Mother) contained within the Specht Report to rank bulls for a variety of traits.