Oh man, here we go. I have 40 chickens in a very large coop. 32 of them have free run of the place. The rest are in cages at various stages of growth. One of the 32 has bloody poop. I have no way of knowing which one. I stood there and watched them all today and no one looks sick. DH did change their food while I was sick. They are now getting a mixture of oats, wheat and corn in addition to their chickfeed. 30 of them are about 13 weeks old and just about as big as my 2 mature hens that are with them. Could the change in feed cause irritation? I give them treats and have never had a problem. .