I lost my RI rooster last week, likely protecting my girls, and we picked up a new rooster yesterday. He's a little younger - about a month or so - than the girls (5) but they're not receptive to him. What's worse is that one of them keeps beating up on him! No blood, but she's mean to him. I just want to be reassured that as he grows he'll take the lead over the girls and they will accept him. Any thoughts?