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I also believe the grays are good producers, more so than Cream Legbars, you could add their barring gene to the blue egger and produce, Barred or blue barred blue eggers that could be autosexing too, thatt is if you concider the Barred Rock to be autosexing, the males having two copies of the barring gene will dilute their down a few shades lighter than the females, you can use this as autosexing trait.. OR you could also cross a blue egger rooster with a California Gray hen and produce sexlinks, the females will also inherit the blue egg shell gene from mother and the cross will also generate some Hybrid Vigor, making egg production better than the average of both breeds
