I had the same issue.. I candled the eggs and 3 looked dark, so broke the 6 eggs. 3 were bad but 3 had fully developed chickens that appeared to be dead, no movement and the embryo sack never broke.
I followed all the process in the incubator, checked the temprature and moisture regularily and...
Thank you for explaining death in chickens due to old age. My "Chirpy" died this morning. I did keep her in the house overnight and she had the violent kind of fit before she lay still. I will lay her to rest today. She lived for almost 6 years
I have had my Mini Fox Terrier for 12 months now. He is 2 years old. I introduced him to my chickens and everything was fine for a few months, until one day he chased two of my chickens and shook them. They both died. I now put him on the leash each time I let my chickens come out of the coup...