I have a little ISA Brown that is laying 2-3 jumbo eggs with double yokes each week. I want to identify her so I can get her with a roo and hopefully pass on the trait. The eggs are consistantly 3 oz.+ in size. Whenever I get an egg that is to large for the 'large' egg cartons, I know it's going to be a double yoker. Anyone else have a hen consistantly laying double yokers?