I recently took in 8 ISA brown hens that are about 1 1/2 years old. Within the first couple days I found a large spurt of blood running down the inside of the nest box they use (vent level). Then no blood for several days and now I've had a second incident. I can't determine for sure which bird is doing it but I am pretty certain it's one of the new ones. The rest of my flock seems perfectly fine, but the new birds have a history of picking and egg eating. (the day I got them they were covered in yolk). The picking and egg eating has stopped now. I think that was dietary. My question is.....Any idea what could cause this much blood? And what can I do about it? Thanks a ton!