We have 15 chickens, Golden Buffs and 3 EE. We were getting 11 - 14 eggs a day and then a sudden drop. For the last month avg is 4 eggs a days or less. The Golden buffs are from less than 1 yr to 22 months old. The EE are less than a year old. I know the less sunlight etc., has an affect but should not be this drastic. Last year we had 6 chickens and they would avg 4 eggs through the winter months. Any thoughts?