I have 6 hens and 1 rooster. For the past couple of weeks I noticed that they are not eating their feed. They use to get crumbles but I switched to an organic pellet feed at the beginning of December. They are fed out of a rabbit feeder that is screwed into the coop wall. They are eating all the lettuce and seeds and grass I give them but are ignoring their food. I even tried to trick them and mixed some food with their scratch and spread it on the ground and they just picked out all the scratch! I am worried they will lose weight and starve, what should I do?