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I have two kinds of white rocks. One had the silver gene and will give me sex link with a New Hampshire. The other will not. You just have to know by looking at the babies. One day old silver gene has a grey tinge on the yellow. I only have one pullet and she just started laying...
That is some bird. You won't get a sex link but you can get a nice bird with a delaware cock. For your New England Whites, I'd use a RIR or NH. That should get you a sex link. (Maybe) They say don't mix a pure white. But It's worth a try. Good luck.