My first flock of birds (17 females, 3 males) has just started to lay. I got 1 egg each of the last 2 nights. I've done some searching and I'm getting conflicting info on how warm the birds need to be during the winter for them to continue laying in winter. I've read "at least 60 degrees", "70 degrees is perfect" and even "no additional heat is fine, they'll lay when it's below zero". What is accurate? My birds are in an unheated insulated shed. I can get some heat in there if I have to. I'm in the mountains of Colorado and it can get WICKED cold here sometimes. Thanks for any advice!