I use colored spiral bands. One color is for the year born. As soon as I can tell, I add blue for boys, all others are girls. I do cull all but 2 of my boys. Any girl that exhibits a trait I'm selecting for, first to lay, largest, broodiness, best color... get's the addition of a green legband granting her breeding privileges. Any girl exhibiting a trait i do not want in my flock, feathered feet, poor conformation, poor laying record... gets an orange leg band showing that her eggs are not to be hatched though she remains as a layer. I will have to move to numbered leg bands for the breeders soon as i am developing 2 families in my flock so i can outcross with in the same flock. And without some way to differentiate the 2 families I could end up with inbreeding.