I have 4 two year old White Leghorns, 3 one year old Barred Rocks, and a one year old RIR. All through the winter were getting 7 to 9 eggs a day. The last month were getting 2 to 4 eggs a day and White Leghorns are having a lot of soft she'll eggs. They have oyster she'll available at all times We feed layer pellets. Any ideas? We're fairly new to this chicken business!