I have 10 Delaware & 6 Barred Rock cockerels, and 2 OEGB chicks in a converted dog kennel. They are about 6-8 weeks old, and have been outside without a heat lamp for the past 2 days. It has been in the 70's and upper 50's at night. Tonight it is supposed to get down to 47*F. Will they be ok without a heat lamp tonight? There is no electricity near the dog kennel coop, so a heat lamp isn't an option. I can move them back to their previous brooder but would rather not if it isn't necessary. They all look to be fully feathered. What do you think?