Yes, you can premix the Corid water for the 5th day. Vitamins are not completely necessary afterward, although they don’t hurt. How old are these chickens? What symptoms have you seen?
I am sorry that she did not make it, but she is not suffering. You can do a home necropsy if the state vet costs too much. Here is a list of state vets including yours:
https://www.metzerfarms.com/poultry-labs.html?srsltid=AfmBOoov-LqOXcOTb3O-inS8Q3u7VOnEG3j6n9cOjWz6GACmMfyy8_b_
I had done a...
Are they moving their necks around to adjust their crops as well? Getting such a yummy treat, some may have gorged or eaten so voraciously, that they inhaled some. Be sure to provide them with water in a couple of places so all may drink. If you need to upload a video to YouTube or a similar...
It could be stridor, a sound they can make when a small piece of food is caught in the airway. That usually goes away in a few hours or overnight after they cough it out. Here is a video showing a chicken with stridor, and let us know if this sounds like it:
Keep the red tissue from drying out. I would use an ointment or oil, and honey could also be used. Time will tell whether or not her cloaca was damaged or not. The cloaca contains the openings for the intestines and the oviduct. Is she able to pass any droppings? I hope that she recovers, but...
Aquasol is a weaker solution and will mix with water. Because it is low dose and put in the water for 5 days, it only treats roundworms, and requires no egg withdrawal time. The Safeguard 10% fenbendazole is given orally undiluted, and will settle out in water. If given once it will only treat...
You could. Open them with a finger and a thumb and apply some Terramycin eye ointment or plain Neosporin ointment twice a day. That can help treat a secondary eye infection. If there is any gunk in the eye, you can flush with a little saline or eye ointment before applying the ointment. Betadine...
Fowl pox virus from mosquitoes lasts about 3 weeks. You could dab a little Betadine on it, but otherwise do not disturb scabs because it can spread the virus. Hold some food mixed with water and egg up to her beak twice a day, since she probably cannot see well.
Wry neck can be from a vitamin deficiency or head injury in young ones. Usual treatment is giving human vitamin E 400 IU and a 1/4 tablet or 1/4 ml of human or animal B complex daily. A bit of scrambled egg for selenium is also helpful.
What are you feeding? How long have the cockerels been gone? Are the pullets having a lot of stress and pecking order problems? They do need some access to crushed oyster shell in a separate container, as well as a layer or all flock feed.
That is the problem with fowl pox and chicks. It can cause swelling around nostril or eyes which can affect their breathing and eating/drinking. Make sure that she is getting food and is able to breathe.