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I never thought of that about adding hens from the Jersey Giants. I may be able to get hold of a blue which would work in getting blues and blacks -anyway.
Yea leakage is a big problem. You mentioned white and white jersey giants- breeding back to the giants will help a *lot* with solid blacks and whites. It will show up in a fair number but it would still be less number than using that cockerel with other black NN.
I never thought of that about adding hens from the Jersey Giants. I may be able to get hold of a blue which would work in getting blues and blacks -anyway.