Quote:
You need to WEAN chicks off their heat source at 5 degrees a week until they're acclimated to the regular air temperatures. If you drop them from 90* or so down to 50* or whatever all at once you are asking for trouble . Also, they NEED to be FULLY feathered out before you put them out of the brooder. Chicks w/o their full feathering can't retain body heat .
Agreed!
5 week old coturnix should be 100% feathered, with their juvenile feathers. They should be able to withstand 70-50 deg. temps. Maybe even lower, but mhwc56 has it right. They should be weaned of the heat gradually.