I have 18 meat birds who are doing very strangely. They are pecking at their feathers or eachothers feathers because there are a few bald spots on some. They all have large bubbles under their skin at their necks. What is going on with them??? My tiny aracauna doesnt have the missing feathers but she has the bulge at the neck. Help please!!!! I'm feeding them Dumor brand chick starter.