I have a question about an incident that happened today. I have 5 leghorns (just reached egg laying age) 4 buffs (just about at egg laying age) and 3 white rocks (also pullets) These chickens were all brooded together and have lived very peaceably until today. I heard a big commotion out in the coop late this morning so went out to investigate. One of the white rocks was sitting in a nest, I assumed she was 'practicing' as all these chickens are either laying or are about to start egg production. I left her in the nest undisturbed. In retrospect, she may have been hiding her injuries at that time.
Later in the afternoon, again a whole lot of commotion in the coop. My husband and I went over to see what was going on. One of the white rocks was dragging a wing and was being pecked (bad damage to her backside, blood, no feathers, etc) by the leghorns. The buffs were making a lot of noise, but at the time I observed them, they were not participating in the 'pecking party'. She was so severely injured that we had to cull her. This all happened in the space of a few hours.
My question is: will an injured bird normally be attacked by others in the flock? The group has now settled down and I haven't heard any more loud squabbling.
Thank you in advance for your advice.