That calculator is limited, and you need to know what genes you are working with. The birds look like a female broiler breeder line, which could be meat type White Plymouth Rocks. One could try the cross and see what happens.
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The people who buy them to eat do not like pure white birds because they assume they come from a chicken house and are not backyard raised. They would rather eat a smaller free range bird than a Cornish X.
Im not trying to trick people bc I don't plan on selling these hens but thought they would do well making a crossbreed with a hertiage.
I now have a new topic to read up on.
I agree when I first picked them up I honestly thought it might be better for them to die out of mercy. They were filthy and stinky; most of the 7 have a large amount of missing feathers. But in a week with my other birds they have cleaned up well. They can be lazy, food monsters, but have free ranged with my hertiage breeds. They are certainly apathetic to everything. Also they live under the nipple waterer I have.
I figured they are adjusting to life not in the climate controlled factory and would live at least a couple more years outside factory life. I knew they had a shorter lifespan than the average chicken.