Yesterday I came to the conclusion that my chickens were pooping blood because of a worm infestation. Well now this morning I have three 1 year old hens that don't want to leave the roost and they are just looking tired. I also noticed that my 8-9 week olds that are in a fenced off section next to the big chickens are starting to poop blood. I just went and bought some Corid and I need to know how to dose these chickens. All they had was the 20% powder.