I hatched out 28 coturnix, reared them in the brooder for weeks. Slowly raised the heat lamp, lowering the temperature over several weeks. Moved them into a permanent cage, inside the garage for a few days first with no heat lamp, then moved them outside right next to my adult breeding flock. This weekend they have started dying off at just about 5 weeks. So far I have lost 17 of the 28. I don't know what is happening or what I can do to help... Please help me!