As far as my breeding strategy goes, I believe the only way to really breed for improvement successfully, you have to single breed. I am not knocking anyone who has a different setup such as flock breeding or trios or quads. I just know that for my plans, I have to be very selective in my breedings. To do this, I have 3 pairs that I am breeding this year. I will collect eggs for 1 month. As those are incubating, I will rotate the roosters. By the time the first sets hatch and get on the ground, I will have more ready to go in. I weight 2 weeks minimum after each rotation to make sure that the old semen is gone before hatching new ones. As they hatch they get toe punched as to who their mother and father are and I then know within a few months what combination worked the best. Any that are faulted, I can trace to who is throwing faults. It is really not difficult at all. Just a little organization and tracking. If flock bred, you cannot assertain who is the culprit for faults with any certainty.