If you haven't already done so, you need to seperate the injured one from the rest of the flock or they will go after the bloody spot. Are you sure it is broken and not just cut really bad? I would pour some peroxide on the cut area to bubble out any debris, ect. If it is still bleeding a lot, you can use something to stop it, I have heard of some people using cornstarch to staunch the bleeding, then followed with some neosporin, without the pain relief. If necessary, maybe a light wrap of gauze. Good luck on your baby.