We adopted some mixes from our neighbors, 2 are austrolorpe/RIR mixes, and are deffiantly hens, but one, a barred-rock/RIR mix, has turned out to be a rooster. We already have one rooster, a golden coment, and our mix has recently started crowing and attempting to make little chickens, our GC is sure to be the top roo, as he is much older and much much larger. We don't want the mix to have chicks with his half sisters, but we do want the GC to have chicks with them, any ideas on how to make this possible?