I'm new to raising chickens. My first batch came from a straight-run bin at Tractor Supply. They were split between male/female, and I've ended up with 6 hens and kept two of the roosters. They're all rocks of varying colors - black, barred, red and white. Now I want to hatch chicks. My concern is that if I hatch my own, do I need to obtain unrelated roosters for next year's breeding? Does this even matter with chickens?