You have to acclimate them to the cold. It's 8 weeks fully feathered if it's 50 degrees. For every week after that they can go down another 10 degrees. 9 weeks 40 degrees 10 weeks 30. It's not simply being fully feathered it's having enough weight on them to withstand the cold. A heat source can...
For every week over ,8 weeks old they can go down another 10 degrees, 9 weeks 40 degrees, 10 weeks 30 and 11 weeks 20, and you have to acclimate them to the cold.
