I have been loosing my young birds (2-1/2 to 5 months). The are starving to death. There is absolutely no meat on their breast bone. Their feet and nails look like an old person's skinny hands with long sharp pointy nails. The are still on chick starter, have water and are in separate cages from the adults. They have been vaccinated for fowl pox, wormed with Ivermectin (orally) and Panacur. I see them eating but they won't gain any weight. It is not all the young birds, just some (Gold Laced Cochins (standard) and bnatam cochins/frizzles). Someone told me it might be aq vitamin deficiency. Please help. I feel so bad because I don't know what else to do. I brought one in the house last night (I thought he was dead, but luckily not) force fed him some Zupreme exotic bird food with water, corn syrup, and vitamins/electolytes. I put him in a carrier on a heating pad in the bathroom and he is still alive, looking a little brighter, but not much. At least he doesn't look dead. What should I do?