I have a few things that I would like to comment on, without sounding like a know-it-all.
Anytime you can get your chickens to get good and full on cold days with oats or bran or scratch is very good. They have an internal furnace and need to be stuffed every day during these freezing temps. Try to mix it up as much as you can and they will eat more.
Personally I use (you don't have to) cracked corn one day rolled oats with molasses the next three-way scratch after that, mix into there layer pellets a medicated chick starter that is about a 10-1 ratio. After all that, they still will not eat out of my hand? Don't figure?
Introducing new birds into your flock is easier than told.
What you need to do is after all are in bed toss in your new bird. Simple. There maybe some pecking order the next day for a little while but alot better than if you toss them in during the day.
You will be amazed at the difference.
The closer to the same size the better it works. Just as WG has stated.
As of now there will not be anymore free chicks as I have completed my fix in my flock.
However I may be able to work deals for different quantities.
Mike