I have six seven week old turkeys that are in a four by eight foot brooder. It's getting really cramped in there. At what age can they go outside in their coop without heat? I took them out today in 50 degree weather and they were shivering. I don't know why I thought that at six weeks they would be ok without heat but apparently not. It is around 50 during the day and drops in the 30's at night here. Thanks!