I have a roo who is about 1yr old, crowing nicely, anyhow i have raised some chics that are now about 6 mts old, there is a couple roos in that batch, they never crow,, although the older roo is in a separate coop from them, is it normal for just one roo to crow, or will the other roos start crowing as well,, the older one is a sebright, the others are RIRs