Right about the Raise your own chicks. I do that every spring, I hatch chicks from my own flock.Welcome!
We either raise our own chicks, or buy chicks, vaccinated against Marek's disease, from good hatcheries.
Were you getting chicks, or adult hens, and did you get some older birds? Diet, housing, diseases from those sources, and bad luck, all have a role.
We will try to help!
Mary
Occasionally I do get new blood, to add but main sources are hatcheries.