my six week old hens are pecking the barred rox

[flockitup]

A week ago I traded three birds off they were roos. When I got home i noticed my barred rock was hurt i think from the fruit box i used to transport the chicks. Her comb was scraped and bleeding very little. I held it dabbed it with my shirt yet no crimson but i could tell it was a fresh injury. i decided that since she wasn't bleeding i could just throw her in with the rest of them and she would be fine. nope the next morning her comb was torn more and i witnessed them pecking her. she has now been separated a week and all healed up and the flock is now coming up to attack her as soon as i put her in the pen. what do i do?

 

[buckaroo's wife]

You might try putting her in with them, but in a dog crate or something...where the others can see her but not get to her to peck.