I hatched 45 chicks this year and kept 6 to add to my breeding program. Now I'm unhappy with the wings of one of my pullets and will sell her (cull) as well. So out of 45 chicks, I kept the best of the best and will add those 5 to my breeding program. In my case, some of them were not from my parent stock...they all came from one breeder. Next year I will begin a closed flock and will only hatch from my own matings.
Remember that you will have deaths...disease, injury, predators, etc...so your flock should not grow exponentially for a while. You will find out as you go along, that by year 3 you will not be satisfied/keep birds that you would have kept on year one. As your birds get better and better, you will sell the original ones that aren't quite as good. This keeps your flock at a mild ebb and flow as far as numbers.
Remember that you will have deaths...disease, injury, predators, etc...so your flock should not grow exponentially for a while. You will find out as you go along, that by year 3 you will not be satisfied/keep birds that you would have kept on year one. As your birds get better and better, you will sell the original ones that aren't quite as good. This keeps your flock at a mild ebb and flow as far as numbers.