Hi , I am a first time user of this forum so I am hoping this is the proper place in the Forum to list this. I have 6 young Roosters about 4 months old. They might be a tad bit older. I noticed blood in their pen this morning and thought a fight took place. I ruled that out when I saw no signs of facial injuries or to any of their bodies, so I stood and watched them all for a bit until I saw one of them spew blood from their rectum. I immediately removed the bird. I went down and checked on the others several hours later and noticed more fresh blood which tells me there is another one with the same problem although I don't know yet which one. I've had these chickens for roughly 6 weeks. Started them on Chickie Medicated Food not knowing what they were feed when I bought them. Then promoted them to Grower Food. For several weeks now they have been on layer ration same as my hen's are. I separated them from the hens around 4-5 days ago. Fresh pine shaving is their bedding, fresh water daily, oats and grit. I'm at a lose as to what is going on? Any suggestions? Thanks so much !!