In HI, we seldom or never write an article about the beef breeds. Nevertheless, there is a good reason to do that now, because the use of beef bulls on Holstein cows is becoming commonplace. In most Holstein countries, the number of inseminations with so-called “beef on dairy” sires has increased tremendously in recent years, in some cases even to nearly 50%. HI spoke with specialists about the phenomenon “Beef on Dairy”. Which breeds are being used for this? And: what is the emphasis in sire selection?