A woman I know who hatches year 'round has a single Cuckoo Marans rooster (a rescue fellow, whom I named Rudy the Rescue Rooster), and a single Cuckoo Marans hen. I have another Cuckoo Marans hen, bought from her when she didn't have the rescue rooster. She wants set up a breeding pen with these 3, and hatch out some Cuckoo Marans eggs, so she would like to borrow my hen for a month (maybe swap me out another of her good laying hens in the interim). 1) How much will the transfer likely upset the hens, and make them stop laying? 2) How soon after the hen goes into the pen with a rooster do eggs become fertile? 3) If my friend does not use lights to help extend her laying season, and I do....will the lack of extra light make my own hen stop laying just when she has become regular? we're getting 12 hours of daylight now; by the end of October we'll be getting only 10 hours. 4) When I bring my hen home, how long before her eggs stop being fertile? 5) What are the chances that my other 2 hens will beat up a newcomer? Thank you.