I have raised chickens for the past year without major problems(did treat chicks for coccidiosis and mites) recently we lost two of the four of our one year old hens pretty suddenly. First the hens stoped laying, then for the next two weeks decreased appetite followed by death. We do not use any pesticides or fertilizers and keep the yard clean. The only thing that comes to mind and my vets could be some sort of toxicity. They get fed hen scratch and occasional food scraps and grapes. Has anyone ever heard of grapes causing toxicity in poultry. Recently it was discovered that is does so in dogs. Have you heard of any othter foods that cause toxicity. I have read the BYC website and noted those.