My black cochin hen has gone broody, but I am worried the eggs might be duds. She has had exposure to a rooster every day, they had a little romance so I'm certain they're fertilized. But two days before she went broody, when we went to let her out at 9am she was sitting on the eggs but then she left at noon and didn't come back at all until this new "broody for real" period, where she has not left the eggs for more than a second since then and has kept the eggs clean. It seems like she has been a good mother to them. She was always turning them and checking up on them while they accumulated, she pushed two chipped duds out of the nest. I'm afraid that during the "temporarily broody" period the eggs started to develop. She was on the nest for at least 3 hours, maybe more like six if she sat on them right after dawn. And the day before she was chased by a dog so I was thinking maybe this riled her up and she decided to abandon them and then changed her mind without realizing it doesn't work like that. When I looked at the eggs after she left they had little feathers among them like they say hens sometimes put there to regulate temperature. In fact, we were so certain that she had abandoned them that we took them back inside to throw away, but then she got all upset and laid an egg and sat on it all broody looking, so we put the eggs back and she's been on them ever since. It really seems like us taking the eggs for duds is what provoked her to sit. My boyfriend also said she was near the nest when he took them so maybe he literally just took them right before she was about to sit... Basically, I am wondering if 3-6 hours is enough time to create the environment for the eggs to start to develop. Or based on all the different factors, the dog scare, the generally good mother-ness, etc, what are the odds she is sitting on a bunch of duds? Thanks for your help! I am very confused.