Doesn't have to be a integration issue----I have seen a hen get in a fight(pecking order) with another hen and get a bloody head/comb within minutes All the other chickens have the desire for some blood and tear her scalp off------No I did not set and watch---I broke up the fight---they went their own way----in a few I heard more commotion and I ran to see/retrieve a torn up hen. I have lost some, but more a lot more lived through it in my many years of playing with the chickens------In my opinion game hens are the worse for this, but they are great hatching hens.