I have 4 ISA Browns, 4 White Rocks, 3 RIR, 2 Barred Rocks and 1 Black Sex Link. All 7 months old, raised from chicks together.(all hens) The Browns hastle no one The BR hastle only the Browns The BSL hastle the Browns and BR The RIR hastle the BSL,BR and Browns The White Rocks hastle everybody The Brown and BSL roosters hastle no one. No big problem, an occasional feather, no blood. Good egg production all in good health. I enjoy observing the natural behavior, all are free ranged. Plenty of room. What do yours do?