egg size

[jacy11]

I have 6 Barred Rocks, 6 Black sex-linked, 6 Gold sex-linked and 2 Rhode Island Red laying hens. I consistantly get 4-6 smaller light brown eggs every day that are quite a bit smaller and lighter than the rest of the eggs collected that day. Any suggestions which breed they are from??

 

[Oopoo]

I've got barred rocks and can get eggs from the normal store egg large to "oh isn't that cute" small size egg. But generally they lay a medium to large size egg.