Half my flock was killed by a pack of dogs this week so I need to get in some new chicks much sooner than anticipated. The flock is 8 month old pullets, a mix of barred rocks and gold sex links. The current breed mix has been fine together and neither breed has stood out as better than the other, but for replacement chicks I was thinking about considering some other breeds. I anticipate an answer that it will make no difference in the difficulty or ease of integrating new chicks into the flock whether replacements are the same or different breeds, but wanted to check with more experienced flocksters before placing an order. If it makes any difference, the flock is free range during the day. Thank you for all comments and advice.