Kneeling! yes the younger roo will kneel in a submissive kneel just like the hens do when they’re about to mate when the older dominant roo is in play.
I can see where someone may need more roosters, I’ve heard a rooster can service as many as 10 hens. This is just a thing I read
Chicken...
I’ve always heard it not a good idea to keep 2 rooster in a flock, because older roosters are very possessive and will brutally beat the younger rooster until he kneels when the older rooster is in his presence, I’ve also been told it cruel because only one rooster will be the dominant rooster...