Honestly, to me it looks like intestinal lining only because it's formed and not liquid like blood. I am by no means a professional though!! :)
I always have my chicks vaccinated for Cocci and Merak's and I see poop like this one quite a bit.
Before you rush to give antibiotics....check out this chart and make sure it's really blood and not just sloughing of the intestinal lining. I was really freaked out the first time I saw it, too!!
http://www.chat.allotment.org.uk/index.php?topic=17568.0