Hen attacked adopted chicks

Fapete

In the Brooder
Sep 9, 2024
9
37
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I have a nearly 1 year old hen who raised her first clutch early this summer. She was a natural! The only negative I can say is I think she left them to rejoin her flock a little early (4 weeks), but everything worked out. She went broody again within a month but only 1 of her 5 eggs hatched. I decided to get some day olds with the hope she would adopt them. And she did! She took all 12 under her immediately. In the morning she brought them outside and showed them what to eat and drink. I thought I couldn't have hoped for a better outcome.

But something changed during the day. I came home to her aggressively attacking all the chicks but her own, and her chick was also attacking the others. I'm very grateful she didn't kill or injure any. So I took the chicks (including her own as I'm not going to raise them separately), kicked her out of the nursery, and set it back up for just the chicks. Any ideas what happened? And I'm wondering if it was a good idea to take her only chick away. She seemed to get over it quickly, I am more worried about the chick. They were together a week.
 
Was her chick a week old when you tried to foster the others? Was her chick a different color than the others?
No, it was 4 days and the rest were 2 days by the time I got them. They are all different colors, some similiar. Her last batch were all different too. I've read a ton about trying to get hens to adopt new chicks, from sneaking them at night or making sure they're all the same color, there are a lot of opinions. Buy I'm perplexed why she would turn so violent after taking care of them for almost an entire day.
 

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