I started off with 12 RIR's and 13 Light Brahma's. I've raised them from chicks and they're 4.5 months old. As of today I've lost 5 Light Brahma's and only one RIR and the one red was when it was a chick on day two and I culled it to do sprawl leg that I couldn't correct. All of the Brahma's died due to injury. Or at least that's what they seemed like. Each one happened at different times... maybe a few weeks from one another to a month. None of them seemed ill before I found them either dead or half dead before culling and I check on them every day. So it seems to me that the Brahma's are somehow getting hurt OR hurting themselves. However, they don't seem aggressive to me unless one is hurt, then he/she gets pecked to death. Are Brahma's injury prone? It just seems odd that I haven't lost a single RIR (aside from the chick,) while I've lost 5 light Brahma's.