Hi! We have 2 barred rock pullets, 14 weeks old. They are doing great outdoors in their coop. We want to get two buff orps and found 4 week old chicks. Winter is coming and the temps in Western PA have dropped to the freezing point the other night. Should I wait to add until the spring or can I still get these babies used to the coop? I just don't want them indoors all winter. Also, if my barred rocks don't lay in the winter, do I still keep them on chick starter until I have my first egg or should I start adding layer at a certain age? Thank you!