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The "blue egg gene" which is responsible for green eggs is not going to show up in the offspring of a brown egg layer unless the roo passes it down. the blue egg gene is dominant so it always shows up in the carriers. When one blue egg gene is present with "one" brown egg gene you get green eggs. I put one in quotes for the brown egg gene because there are said to be several genes that make up brown eggs which is how you get the wide variety of brown shades. So your hens are not carrying the blue egg gene but your roo still might. Any offspring he passes it on to will lay green eggs because they will get the brown egg stuff from the hens.
ETA: That is also why you get brown egg layers out of green egg laying flocks. The stock carries one brown egg gene and one blue egg gene so you can get green egg layers, blue egg layers, and brown egg layers from the flock.
The "blue egg gene" which is responsible for green eggs is not going to show up in the offspring of a brown egg layer unless the roo passes it down. the blue egg gene is dominant so it always shows up in the carriers. When one blue egg gene is present with "one" brown egg gene you get green eggs. I put one in quotes for the brown egg gene because there are said to be several genes that make up brown eggs which is how you get the wide variety of brown shades. So your hens are not carrying the blue egg gene but your roo still might. Any offspring he passes it on to will lay green eggs because they will get the brown egg stuff from the hens.
ETA: That is also why you get brown egg layers out of green egg laying flocks. The stock carries one brown egg gene and one blue egg gene so you can get green egg layers, blue egg layers, and brown egg layers from the flock.
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