We have 7 guinea eggs due to hatch on Saturday. We'll be gone camping until Sunday. The eggs are under a broody hen. it's been getting down into the 40's at night here in Kentucky. The brooder with the hen and eggs is inside our insulated barn. It's still chilly in there at night, but protected from wind and about 5 or so degrees warmer than the outside air. My question is, do we need to put in a brooder lamp with the hen in anticipation of the babies being born? Or will the momma hen keep them plenty warm? And if 40 degrees outside is warm enough for no brooder lamp with a momma hen present, what about if it drops even colder? With the weird weather we've been having, it could drop to 30-something or even less before these babies have all of their feathers. Thanks!