I agree with production reds, especially if eggs were brown. however it's not unknown for fertile egg market flocks to have hens of X and roosters can be "anything goes". So they could be something like ?? roo bred over production red hens.
If leghorns were involved almost assuredly they will have dominant white, which turns black pigments to white. Those have plenty of black pigmentation, making leghorns not very likely at all.
If leghorns were involved almost assuredly they will have dominant white, which turns black pigments to white. Those have plenty of black pigmentation, making leghorns not very likely at all.