Hello!! We have 67 chickens which we purchased last fall. It is a mix of leghorns, black astrolorps and red stars. They were giving us eggs beautifully at around 5 dozen a day, and instantly they all went on strike. We have not altered their feed. We let them free range one day a week. They have enough water. We have calcium, which is free choice, but they don't seem to be interested. They do not appear to be stressed. They have a huge run. Many boxes to have their eggs in. No evidence of mites in the boxes. Enough sunlight as we are in Wisconsin. No "pasty butt". No predators. We are quite baffled at their lack of eggs. Any ideas? Any suggestions? We have many family and friends anxious for them to come back on line.