I'm so sorry you are going through this. I do not think I can help but have questions for you anyway (I'm trying) ...
I'm sorry to say I'm not sure what to make of the problem there, but going by what you wrote, it sounds like sour crop to me. I have read here- and never tried because it sounded dangerous- that some fed monistat or something for fungus to their chickens that had sour crop. (Like a topical anti fungal skin creme) It sounds really reckless (which is why I didn't try it) but I am sure that the medicine in those products would treat the fungus that causes the sour crop, but it may hurt or kill or maim the chicken that one feeds it to. If you are at a loss and keep loosing birds, it might be worth a shot.. Is the corid working at all? Is there still blood in their stools?
Other things I've heard to try if its sour crop - pineapple and/or pineapple juice. Possibly milk kefir (not the stuff from the grocery store, but homemade) might help? Yogurt would be similar to that but less efficient. How about a bit of Oxine AH (not activated) in their water, or tube feed a bit of that water (there is a certain ratio mix) if they are not drinking on their own. Feed fresh peppermint leaves or pepermint oil, but if oil, make sure its diluted! Oregano oil- go easy with this at first if tried- you absolutely do not want to feed them lots of it- not eve a drop that isn't diluted quite a bit or you will burn their system out! But that could possibly work very well if diluted in water (like a drop) and try that at first and try and increase it if you see no difference. Oregano oil is powerful stuff and a little bit can go a long way- you could probably get some of it either at your local health food store or maybe even
walmart? I think its a fairly common essential oil (food grade) to find. The only other thing I think I heard/read of is epsom salts (this is not regular table salt).... but I am not sure of that at all... maybe do a search on that here? #Epsom salts and sour crop.
There are lots of other posters here that know a lot. I'm just a ametuer. I hope some people start chiming in for you as I am so sorry you are going through this. Its so scary to go through it and so frustrating and sad to not know what to do to help.
I'd have to say, I'm really curious about the cocci (if it is that) outbreak followed by a sour crop (if it is that) outbreak.... it sounds like a clue, but I'm no way near knowledgable to really take a guess as to what that could mean.
Some other questions I have:
Did they possibly get into anything they should not have eaten?
Can you take a picture of the bloody stool and post it here?
Has the weather conditions there been dampish? Wet?
Do you freerange your flock?
Wishing you the best of luck to get this under control. Sorry for your losses as well.
