Here's the deal . We started off with six of the greatest RIR ever ! They were so sweet . We raised them in a container until they were big enough to move outside . After we moved them outside , they poor birds started dropping like flies . It started off when I went out to the coop to clean the food and water containers and I realized my roo was just laying there in the corner by himself . To my surprise he had died . Of course I called the vet to see why this healthy bird had just passed with no signs of illness at all . The vet said he thought it was related to our juristic weather changes that our city had in the past few days . No biggie right ? It happens ! Well with two Roos and three hens left . We were doing good . Then the two Roos started fighting . I knew to expect this . One was butchered but business was still good . Now the hens are laying . Literally . Just laying on the ground . Still alive but just still . So , round two of the vet ! He says , sour crop . So we got new food , antibiotics , and some oyster shell . Still , no change . We ended up losing our last roo , and one of our hens . Now we're down to two hens .. Out of the six we started with . I figured , maybe it's bird flu ! The hens got there shots , the coop was emptied , bleached , and rinsed . The ground was treated as well . Now my two remaining hens are doing great . Laying once a day , no fighting , happy loving birds . So ... We tried again . A dozen ISA Browns this time . Same thing . We raised them up , and got them out to the coop . They did great the first few days , then boom . Dropping like flies again . They fought with the older hens , and lost . (These were not small birds . They are the same size as my RIRs at this point ). Three months later , I am now down to six birds total . We get an egg every day from each bird . Everything seems to be going great .. Until yesterday . I went out on my normal trip to collect eggs and stock feeders , when much to my surprise , another ISA has been attacked . Five .. Okay now I'm overly frustrated . I have put a lot of time money and love into these birds . This morning I went out per usual and found one ISA with missing feather and a bleeding rear end , alive and eating well , but still injured , And another laying by herself . Not this again . I walked over and touched her on the rear with my boot and much to my surprise , a hen who cannot possibly regurgitate , regurgitated a brown liquid and proceeded to flop around on the floor for about 5 to ten seconds before , at my worst fear , dying . I now have three healthy birds and one with a sore on her rear who I'm sure is going to pass too .. That's a total of 15 birds who've died . What else can I do ?