I emailed the seller. Here is the reply:
That is a white rock. They are sports off Barred rocks and that is how that breed was begun. Less than 3% of Barred Rocks hatch out white. You can use them in your breeding program since they still carry the the barred gene, but I would only use it if it had excellent type. Did I have any markings on that egg? It can only be a barred rock, because I have no other breed on the farm.
And he showed me this picture, of one he hatched in 2009 (in the background):
That is a white rock. They are sports off Barred rocks and that is how that breed was begun. Less than 3% of Barred Rocks hatch out white. You can use them in your breeding program since they still carry the the barred gene, but I would only use it if it had excellent type. Did I have any markings on that egg? It can only be a barred rock, because I have no other breed on the farm.
And he showed me this picture, of one he hatched in 2009 (in the background):

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