Okay. You think it could be Marek’s? I know that’s something that lots of people jump to, but look at these symptoms-> https://thepoultrysite.com/disease-guide/mareks-diseaseNo they did not get layer ration at 8 weeks. Only in the last couple weeks (11 weeks) and it is organic layer ration, but they have still been eating the medicated chick feed mostly.
I already took one to the vet and he couldn't figure out why they would not be gaining weight. No eye infections, the poop was normal. They were just as stumped.
Not all of it is totally true, but some is at least.