Just found this thread by coincidence, but on the discussion about creating a new line of them, the White in Jersey Giants is a simple recessive white just like it is in the Langshan, so if you want to improve the quality or start a new line on the Whites, you can cross them to Black (or a blue but that's more confusing), and then either breed those offspring together for 25% whites (50% of the offspring will still be carrying white) or breed back to the original White for 50% White and 50% Black split to White. I can't believe I'm about to say this but you could probably even get away with using a hatchery male for the first year over really good stock Blacks.