They look quite normal....I would guess they are approx. 6 lbs dressed right now. We have processed Cornish X up to 8 lbs. As long as their feet stay okay, you should be okay. Worst would be some extremely hot weather as that could stress their hearts. Good idea to keep the lights off at night...
I have the exact same brooder......it is an awesome unit.
I have the exact same brooder......it is an awesome unit. They were built somewhere in the late forties and into the fifties from what I could research. The material in the heaters you thought might be asbestos is really buffalo board...
