My 2 hens started eating less in the winter so I increased the protein content of their food from 16% to 22% layer feed. My one hen has always layed a nice large egg since she went through a minin molt. I have added 2 new pullets now 4 month old so all all eating the layer/ grower 18% with oyster shell available at all times. Recently I have notice my large egg layers eggs are getting smaller. What is the reason? Any ideas?