Have you wormed them? If you're feeding them adequate protein and they have all they can eat and they're eating good but are still not gaining, perhaps a good worming is in order. Gather up a good sample of everyone's poop, take it to your vet and ask for a float test to see what kind, if any, worms might be present. Eggs may be microscopic. Treat for what the vet says they find. Even a vet that does not treat birds can do this. Good luck!
You probably will not find chicken wormer at the feed store. Valbazen liquid goat wormer will work fine. Give 1/2 ml orally by syringe (no needle), then again 10 days later. For layers, discard eggs during treatment and for 14 days after.
You probably will not find chicken wormer at the feed store. Valbazen liquid goat wormer will work fine. Give 1/2 ml orally by syringe (no needle), then again 10 days later. For layers, discard eggs during treatment and for 14 days after.