I guess I chose poor wording. It would go backward because that is the way of nature. Prior to the late 1800's the average chicken laid 60-75 or so eggs a year. It wasn't until they figured out selective breeding that they brought them up to better standards. If you allow them to flock breed only, that means that the birds on the low end of the bell curve will also reproduce, and over time you will see your flock slowly fall further and further behind. Same with slow growth, and overall size for meat qualities too. Heck ask some of those dirty "show" breeders how hard it is to keep size up on some of these breeds, and notice how small the hatchery bred birds are? If our chicken breeds today were naturally occurring and their traits were naturally occurring, a product of natural selection, then you could communally flock breed and be fine, but they're not, so you can't.What's wrong with average? The mean would be average. "Allow stagnation and regression to the mean over time"...why, how? I guess I just don't understand how a breed could go backward? If the hen and roo are true to breed to start with, and reproduce, the offspring would still be true to breed. Like catdaddyfro stated below:
I'm trying to glean and learn as much as possible before we start our new flock this spring. I somewhat understand both arguments. I understand separation. I'm looking to keep my chickens self sustaining. If all I want is to purchase a good quality starter flock and continue to propagate from there, why can't I? If I am going to keep a flock it will be strong birds that perform the way that I wish. Why would they not continue to hold to breed and perform even with communal/flock breeding?
You can absolutely purchase a good starter flock and continue to propagate from there. But without a good selective breeding program it will falter eventually. You will have to continually select the birds that give you the qualities you're searching for and breed from them. As has been pointed out, this is the Farming and homesteading thread, so most in here aren't going to care if a bird has slightly off color (say a black feather in a barred bird) but that grows fast, has a good frame for egg laying (long wide and deep) and lays early while being very active in foraging if allowed. That would be a good bird for someone who is concerned with producing food for themselves and their family. You wouldn't want to breed from that bird's hatch mate maybe though, if that hatch mate was slower maturing, pinched at the tail, not very active and vigorous. If you were flock breeding, you wouldn't know if the eggs you were hatching came from that inferior bird, or if it came from the good bird. That's all anyone is saying.