New rabbit...... growling/grunting?

Well I am a rabbit breeder so the grunting is normal for a male. He either is being territorial or is "demanding" something. One of my males did that for a while because he was jealous of the others having mates, so when I bought him a female he stopped. ^^ And the rind ring thing, I am not positive I think it from the breeding, but I have never heard of it before.