What is the name of a group of race horses?

They don't really have a name for a group of race horses as far as I know. Cause generally when racing, they compete against each other. And it's a solo race for the win. So there is no association with the other horses, like for example a team of Basketball players.

There is no real name for a pack of race horses or a herde of race horses, or horde of race horses..............