Folks - my flock has suddenly lost its mind. About two months ago my girls decided that they were too good for thier feed and began to free range for all their meals (we have about 100+ acres at our disposal so the wander all over the place). I did not think much of it other then now I get to save a few bucks on feed. Now the problem has appeared that all thier eggs are too soft and are only leathery shell which break under thier own weight. They have been laying all summer with no problem and good tough shells. Any idea how to convince them to start eating thier feed and oyster shells again? - I have had chickens for five years now and never had my flock do this - any idea of a cause?? Thanks for any help y'all have to offer