I'm investigating two possibilities, this is the first; recently (2024/04/30) I got 3 hens: two white leghorns and one Amber star. They are all within 3weeks age and the amber star started laying small but, cute eggs. Three days at her new home, the bigger legorn started laying too on the 3rd day - I was impressed - they both continued laying reliably for about 3 days when I noticed the leghorn exhibiting signs of the brood. I've read a lot about it so I was excited to deal with it
she now, seems to be depressed. From day one she was aggressive but now she only picks on the other smaller leghorn. Since then the amber star has been the only reliable layer.
I've taken measures today to isolate the aggressor and they seem to all be chilling. I'm hoping that the mean leghorn will learn to appreciate her friends. Moreover I'm hoping she calms down and relaxs enough to start laying again. I'm running this operation for 4 days before calling it a failed idea.

I've taken measures today to isolate the aggressor and they seem to all be chilling. I'm hoping that the mean leghorn will learn to appreciate her friends. Moreover I'm hoping she calms down and relaxs enough to start laying again. I'm running this operation for 4 days before calling it a failed idea.