I restarted the incubator on February 14 with updated settings – temperature 38C, humidity 60%. Everything was going well, but on February 24 – 25 we had 12 hours power outage. The incubator cooled down to 15C. I was thinking that all is lost, but on March 6 the first chick hatched! Than on March 7 hatched 2 other chicks out of 15 eggs. Next day I opened all other eggs. There was 7 more dead chicks inside.So the fertile rate is 10/15 = 66%. Not so bad for winter.
I called up a broody hen Farby. Her current chicks are already 6 weeks old. I put her in a broody cage in the basement and slipped the chicks at night. In the darkness she was OK.
But when I moved the cage to light she started to attack chicks…
So there was no choice. Farby returned back to her old chicks and all were very happy. Chicks went under the light bulb until their new “electric hen” will arrive.
There was a funny consequence of this. Chicks learned an aggressive behavior from the hen and continue to attack each other sometimes.