Only thing I can think of is Mareks, the way you describe some being paralyzed and then sometimes getting better. Since you used Corid for so long, I think you should replace their b vitamins. Maybe Nutri Drench.
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I am really sorry you are having such a hard time!
First off: Paralysis is not part of the symptoms of worm overload or coccidiosis so you are dealing with something else.
Why do you think you can exclude Marek's? It seems like that is very likely.
Corrid is given in a 5 day course. Giving it longer is useless and deprives the chickens of the b vitamins they need. Also, electrolytes are for chickens suffering from dehydration. If you are talking about an electrolytes/vitamin mix, that is not to be given at the same time as Corrid as it counteracts that medicine. You give vitamins (b vitamins in particular) *after* the five day course of corrid, because you have just been depriving their bodies of that vitamin for 5 days in order to weaken the cocci.
I am writing this for future reference and for others, as I really doubt your troubles have anything to do with coccidiosis. But when you buy and use medication always make sure to read the instructions carefully and follow them - otherwise you are just wasting your money and risking the health of your chickens...
Keeping chickens in cages is a recipe for all kinds of trouble. I realize that you only started doing this after some got sick, but you are not helping the issue and inviting additional trouble instead.
Are you giving them grit? While free ranging they could find their own, but put up in a cage you will have to supplement granit grit (not just oystershell or other calcium source) so they can properly digest their feed.
Do not feed corn in addition to a complete chicken feed, they will end up not getting enough protein overall, especially if you also feed fruit. Why feed starter and layer?? It's either, or. Starter is fine to feed forever if you give extra oyster shell free choice on the side. Do not feed layer feed to pullets before lay or to roosters, there's too much calcium in it and that will harm their kidneys over time.
If I were you I'd pick a good quality grower or all flock feed, offer oyster shell on the side and feed nothing else until everyone is better.
Read up on Marek's and evaluate again if that could be the problem...
Im telling you it's not mareks. If it were mareks they would have all died within the first couple months. This has to be some new diseases or a combination of diseases.
Im not an expert but I've seen my chickens symptoms and it's not anything 'simple like everyone is saying. It's not simply mareks,( I wish it could be that way I would at least know something).
I think a couple of mine had cocccidiosis, because they did have the exact symptoms. But I think it was this with a combination of something else, because after the 5 days of corrid, there were no more pooping blood.
Its not worms, because I've had them dewormed.
A few of them had love, but I got rid of them and the chickens stayed with disease.
Unfortunately for me even if my chickens conquer the disease, it will be too late, because they wont grow anymore.
This is for the future chicks, I need to know what this disease is so that my next generations will not have the same problems
Ps: I've been giving them unfiltered water from around the same time that the disease started, could this have any corralation with the disease?
I just noticed that their water was unfiltered, I'm giving them filtered water now.
Well, thank you for the bad news. No seriously thank you. Now I know that my chickens have mareks, the disease I've been denying for a while.Your knowledge of Marek's is totally incorrect. Have you actually read any of my previous posts on this thread?? The symptoms you are describing are exactly Marek's and I should know because I've been dealing with it for 3 years.
Going through your list....
1. In my experience most chickens with it don't do the splits although I have had a couple that did. I have documented many times on this forum how a chicken with Marek's has suddenly been significantly lame for a few days, even a couple of weeks, and then almost as suddenly come right and been totally fine for as long as a year afterwards. Many times it has come on suddenly and they were fine one moment and floundering on the ground unable to get up the next, so I can assure you that it can come on that suddenly.
2. Marek's affects mostly juvenile birds, so I have no idea where you got the information from that it affects adults. The prime time is from 8 weeks to 20 weeks. Adult birds can get it but it is unusual and more often a secondary outbreak where the virus has just been dormant..... so your birds that are recovering may have an outbreak in a year's time when they are adults. The vast majority of Marek's cases occur during adolescence.
3. Marek's causes muscle wasting. It is one of the classic Marek's symptoms, so yes the birds with it will be skinny even though they eat well.
4. I've had the occasional one with neck twisting (and wry tail) but like you describe, it has been towards the end where they were dying. Most have not shown this trait.
5. Failure to thrive, they stop growing or lose condition is the same as point No.3. Often it is caused by tumours in the body. The comb (you describe it as a crest) is an indicator of the health of a chicken. It will be large red and fleshy when they are healthy and in prime mating condition and pale and shrivelled or discoloured if they are moulting or sick.
6. My Marek's birds have not shown any skin lesions or ocular irregularities either, but I can assure you they still have Marek's. I've had the odd one with wing paralysis but it is not a common symptom, so not surprising that you haven't seen that.
Marek's can have many different symptoms. As well as the more common ones like paralysis and wasting/failure to thrive, it also compromises the immune system, so that birds infected with it are more prone to things like coccidiosis and respiratory and digestive tract infections that their bodies would normally have immunity to or fight off.
As others have said, get a necropsy done on the next one that dies or if you are in the UK, there are vets offering faecal testing for it..... you may even be able to send a sample in the post. I'm not sure how the faecal testing works yet or how accurate it is, but I've read a couple of references to it recently.
From the symptoms you are describing, I am very confident that your flock has Marek's. It matches almost exactly the symptoms I see in my flock.
If it is any consolation, after the initial outbreak in the first year, things seem to settle down a bit after that and you just get the odd one or two in subsequent years. At least that is my experience.