Hello!! This is my first year raising chickens, we got them at different times from april to may of 2014. My mottled java decided after laying only a couple weeks that it was time to get broody. She has been sitting on the nest for at least a week or so now and I am thinking about getting a few of my friend's fertile eggs (I don't have a rooster) and putting them under her. She lives about 30 minutes from me. Do I need to get them as soon as her hens lay and keep warm until I get back to my house and put them under my hen? If the eggs cool down do they die? Thanks!