 how old we need to test them for. Because the reality is a bull that's 18 months old is much more likely to have a bull that's, have tricked than a bull that's six months old, right? Because a bull that's six months old probably hasn't bred any cows. And the cows can be a replicative host. So they can get it from a cow, they pass it back to the bull, they kind of pass it both ways. And so essentially...