Sharing this horrible story in case it could prevent someone from making the same mistake.
Out of 18 serama eggs, I had 8 hatch. They were in the brooder chirping last night and since I had to get up at 5 am this morning for work, I thought instead of them keeping me up I'll give them to one of the 3 broody hens that I have. I stuck them under the white cochin since she is the leader of the flock thinking no other birds would peck them. I stayed with them for about 10 minutes and didn't see or hear her attack them. When I checked on them around 5:30 this morning, half were dead. She had scalped them.
WARNING GRAPHIC PICTURE.
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The 4 dead chicks.
Pictures taken yesterday when these 4 were still alive
Mottled chick from an egg labeled "Frizzle"
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A sibling also labeled "Frizzle" black - the first to hatch on the 10th at 9:45pm. The 7 others hatched yesterday.
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Micro silkied chick
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The last chick that hatched that was from an egg labeled "Laced".
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The survivors:
This chick hatched from an egg labeled "Frizzle brown black"
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Wheaten
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Blue laced
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From a frizzle egg.
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Here the 8 were yesterday before I took them out of the incubator. The other 2 eggs I candled and there is no movement but I am leaving them in there until day 23 (Monday) per seller's suggestion.
So I learned 2 lessons from this hatch. Not to give a hen chicks without watching her interaction with them. It was at night and She was sitting in the nest and the chicks were just under her. I've also had her for 3 years and she is 5- she had taken care of many chicks that weren't hers. But this time she was only broody a week- I think that may have been the problem. I wish I had taken her off the nest and seen how she interacted with the chicks but the last time I did that she just jumped back to her nest and rejected the chicks in April. I just thought the chicks I bought were too old. I believe 5 days is the maximum and the chicks had little wings so they may have been 6 or 7 days old.
My 2 other broodies rejected these chicks. When I arrived at work they accidentally scheduled an extra colleague so I was glad to go home to be with the chicks. I set up the aquarium with the cozy coop heater like I did with the chicks in April and they are doing ok. The frizzle chick has 2 peck marks above its' eyes but they have dried and the chick is doing good.
Another thing I learned is that I originally bought 6 eggs then changed it to a dozen and the seller gave me half a dozen free. Out of 18 eggs 8 hatched so I probably only always buy at least a dozen eggs and rehome the others if I need to. As long as DH doesn't get attached to them. After I saw snowball peck them I put her to give away but DH made me take the ad down as he wants to keep her forever.