So I live in Manitoba, Canada and its been regularly between -30 and -40 overnight. I've got a bunch of ISA Browns that seem to be fine in this cold, but I've also got some 6 week old chicks bred from them. I recently tried to put them in a semi insulated brooder to get them out of my basement and despite their bring under a brooder lamp, three of them died and I had to move them back inside. I'm just wondering if I tried this too early or whether they should be acclimatized in smaller increments somehow. Even in this brooder it got below freezing despite the lamp. Any ideas on age to put them out. I'm a little concerned because I would like to put them with the other chickens at about 8 weeks. Thanks.