I have a huge bag of Organic Oat Bran. I'm not familar with it. Is it something I can throw a couple handfulls to the chickens eveyday?? Does anyone know of any reasons it might not be healthy?? I have 10 pullets that are about 5 and 1/2 months old, not laying yet. Any input would be appreciated. I don't want to make them sick. Thank You!