I have had 6 Salmon faverolle eggs in my incubator. 4 out of the 6 looked full but they had nt hatched out at 23 days so I opened them to see what was going on. To my shock I found the 3 out of the 4 eggs had live chicks in them (well barely alive). The egg with the dead chick was fully formed but the yolk sac was still outside. 2 of the eggs had live chicks with yolk sacs outside and the 4th egg is still in the incubator with the chick alive. I don't hold out much hope of it surviving but it's still breathing so we'll see what happens.
I have had other chicks hatch out in this incubator although the hatch rate has nt been good.
What would cause this to happen? Is it a temperature or humidity problem? Or just something wrong with the chicks / eggs?
I'm fairly new to this chicken thing so any help would be great.