My rooster is not developing and may have mareks.

[Briseggs]

Early this year, we took Marcell(my young barnevelder hen) to the vet because she kept falling over and wasn't walking properly, the vet said it was mareks and that she didnt have long to live, the vet diagnosed her by looking at the state she was in but we didnt actually have a necropsy. However, we also went to see a lady who sells chickens, and we told her about how Marcell kept falling over and she said it could be a vitamin deficiency and recommended that we give her tuna and vitamins. We gave Marcell all of that and more and she noticeably got better, her feathers were shining, she was walking properly, she seemed fine. We recently went away on holiday and left someone looking after my chickens. All was fine until the day before we got back, Marcell was falling over, she could barely walk and one of her eyes had gone a murky grey. The lady looking after them said that she fell over in the morning and didnt get up so she tried to help her and feed her but half an hour later she sadly died. I thought that maybe because no one was giving her all the nutritious stuff I had been giving her, that maybe the disease caught up to her and killed her, but honestly I dont know.

With Lewis, my young Isa brown rooster, he is really underdeveloped, the two other roosters we had were much more developed and bigger than him even though they were younger. He, like Marcell, struggles to walk, he stumbles to walk and if he runs he usually falls over, he went through a growth spurt, and he got his crest and wattle bigger than it was and bright red, he also started crowing and tried to mate once but after a few weeks he completely stopped and hasn't since. I'm also not sure why he is like this but its not like he gets bullied, he eats and drinks completely normal to. Does anyone know what could be wrong with Lewis and if what Marcell had was mareks?

 

[Eggcessive]

The grey eye can be a sign of ocular Mareks disease. Mareks can also cause paralysis of one or both legs or wings, sometimes a twisted neck, tumors, and wasting. It does sound like you might be dealing with Mareks in your flock. A necropsy by your state vet or poultry lab if you lose your rooster would be the best way to confirm Mareks. Here is some reading about Mareks:
https://extension.umd.edu/sites/ext...Preventing Mareks Disease in Small Flocks.pdf

https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/