Sorry for your loss. Was Mareks confirmed by a necropsy or the state vet? Many times we cannot really know what is causing an illness like this until after death when a necropsy and testing is done. Mareks causes low white blood cell count and that can make them susceptible to any common disease...
Looks like one of the weird tubular shell-less eggs that broke inside. I would repeat the calcium for the next 7 days. Calcium citrate with D3 is available at Walmart in generic Equate brand. 300-600 mg daily is good. Here is a link with a picture of tubular eggs...
Are the roosters or cockerels by any chance getting bullied away from feeders and waterers? Depending on your location, a necropsy is affordable, and then you would know what is killing them. Also check the feed or any scratch grains for any moisture or mold. It can appear overnight if a little...
What is your location? How old are the birds dying? Can you post a picture of any or the combs? Most state vets will do an necdopsy/autopsy on 1-2 birds to look for a cause of death. Here is a list of state vets:
https://www.metzerfarms.com/poultry-labs.html
So glad to hear they are all acting better. Glad the Corid has helped in time. It is unfortunate that you lost the 2, but I hope the others all survive. Let us know how they get along.
I do think that a prolapse might have happened and the others may have pecked and injured her, but the fly strike sounds advanced. Vent pecking is another possibility. There was a similar case in a thread in the past week, and then hen did not survive. Get on this right away, and it will...
There are a few members in N. Florida that might help you out, or sell a little to use before your order comes. But I would go ahead and order it. I have used Jedds.com before with good results, but not sure if they would overnight it. Heading toward the weekend can also slow delivery down.
Good advice by Wyorp Rock. I think that occasionally we see some yellow urates if B vitamins are given (especially thiamine.) I have helped a chicken empty its crop, and I won’t do it again, since it is a very risky procedure that can cause aspiration and death.
I would used the vitamin E and B complex for thiamine daily along with a small bit of scrambled egg which has selenium. Vitamin deficiency, head injuries, and certain diseases can be common causes of wry neck.
I usually do the simple surgery, but sometimes using an Epsom salts soak for a day or two before hand may help. You would want to soften and remove the black scab and then squeeze out as much of the yellow core as you can. There are many methods of removing bumblefoot infection.
It think the eyeball has been punctured by the first picture. Was the pus yellow or white? I would continue flushing the eye with either saline or eye wash 2-3 times a day, followed by applying either Terramycin eye ointment from a feed store or plain Neosporin or Triple Antibiotic Ointment...
I will ask @Wyorp Rock who might be able to remember that thread of the screw coming through the skin. If anyone else does remember it, let us know. I had suggested that the cut off the tip of the screw that was piercing the skin, to make it less sharp.
I like to keep the hens with their flocks, unless they are being pecked or bullied. If that is happening, I keep them protected inside a dog crate with bedding, food and water. Even if one is sickly or dying, they are usually more comfortable with the other chickens.
The crop should be normally empty in the morning, and gradually fill up with food and water by bedtime in the evening. If it is full in the morning, tell us if it is soft and mushy or hard, or dough-like. Crop problems can be from different causes. Coccidiosis may sometimes cause a puffy or slow...
Since she is 3 months, if she seems like she might have coccidiosis, with symptoms of lethargy, runny poops, not eating, and standing around puffed up or hunched, I would start some Corid (amprollium,) from the feed store. Dosage is 2 tsp per gallon of water with the liquid, or use 1.5 tsp per...
Is there any food in her crop tonight? How does it feel—empty and flat, full, firm, doughy or squishy? Recheck it again in the morning before she has any food or water. Did you get other birds from the seller? Do they seem okay? How did it seem like they were kept previously? It is pretty good...
I have seen that before in one of my roosters. I used an antifungal cream miconazole to treat it thinking it was favus, a fungus. It doesn’t look like the tropical pictures we see of favus, and some have suggested trying to wash it off the comb with warm soapy water and a rag. Povidone iodine...
Can you show a picture of the leg and scales? I would use Nustock cream on the legs every day for a few weeks. It has sulfur powder in pine oil and it kills the mites, while soothing the skin. Vaseline is also good to smother the leg mites, and neither has an egg withdrawal. What strength of...
That is something I have never seen before. It has a bit of an appearance of an ingrown feather cyst, but I haven’t seen one on the comb before. It could be an abscess from a peck wound, or a cyst or tumor. Is it soft or solid? It looks fairly smooth with some fine feathers coming out of it...