If you don't have a thermometer in the brooder, how close or far they stay from the heat lamp is a pretty good indication of what temp they are preferring. I like having a thermometer, just so I don't get things too hot or too cold. You can pick up a pretty cheap thermometer at
Wal-Mart for a dollar or two.
As far as the shivering, I'm having trouble guessing what that is about. Do they stop shivering if you cover them in your hand like they are being covered by a mother hen? Cup your hand, and cover it with your other hand... soft but secure... kind of like the way a newborn baby likes to be wrapped, but loose enough they can kind of wiggle around in your hand. My chicks always relax and go to sleep when I do this.
I've never raised silkies, so I don't know if this is a trait these chicks have or not.
I had a GREAT weekend, worked last night, now I am off tonight, so I am going to go out and work on my set of cages. I am down to building the doors, top and painting. I hope to get the doors built and everything painted today, then I can do a second coat and install the doors and it will be done. It's going to take my hubby's skidsteer to move the thing.
I've got a black ameraucana rooster that I am going to save as my breeder. He is wild. He has been running free range all summer, and he hides in the weeds. I couldn't find him a couple days ago, and I was panicking, thinking perhaps something had killed him. The next day, there he was, out ranging in the pasture. I'm going to try to find where he is roosting and catch him tonight before he becomes owl bait or something. He is a beautiful rooster. He keeps a black ameraucana hen with him that I need to catch, too.