This flock I have is a closed flock I raise my own and sell Chicks to others with closed flocks. Or at their discretion?..Mine have ILT since Chicks so heated Coop is a must. I have Chicks out that need heat now or I'll be doctoring Birds and could lose them. Crappy weather came too quickly..That's too bad! Hopefully they are all okay!
I've gotten lucky with adult bird diseases, but not so much with my first year of chicks.