Difficulty walking can simply be a sign of weakness, but it could also be a sign of diseases like Marek's. However, from what I have heard, Marek's only leads to paralysis, not death.
A good quality food should have everything they need. They are nearing the age where they should start laying, which could be part of the problem. Vitamins can be supplied through giving them greens, insects, and scrambled eggs, as well as dry cat food.
Okay, so the food and pen are clean. Sounds like they are being given good care
. Could the storage bin have musty food in it?
Okay, this is starting to get really confusing. Sometimes people sell bad chicken food that doesn't have the necessary nutrition. Could it have something to do with the food?
Are they pale? Sometimes worms are hard to detect. Worms often lead to paleness of the skin, wasting away and weight loss. Culprits include roundworms and hairworms.
If the corid doesn't work (and I hope it does) than you could try antibiotics as a last resort, to try to treat any infections they could have, such as E. coli. Before antibiotics I would try a dewormer.
I hope they start getting better soon!
A good quality food should have everything they need. They are nearing the age where they should start laying, which could be part of the problem. Vitamins can be supplied through giving them greens, insects, and scrambled eggs, as well as dry cat food.
Okay, so the food and pen are clean. Sounds like they are being given good care

Okay, this is starting to get really confusing. Sometimes people sell bad chicken food that doesn't have the necessary nutrition. Could it have something to do with the food?
Are they pale? Sometimes worms are hard to detect. Worms often lead to paleness of the skin, wasting away and weight loss. Culprits include roundworms and hairworms.
If the corid doesn't work (and I hope it does) than you could try antibiotics as a last resort, to try to treat any infections they could have, such as E. coli. Before antibiotics I would try a dewormer.
I hope they start getting better soon!