No I can't say that I have, I did a quick google and came up with nothing. I did come up with an article on the Chicken, according to the article all poultry has the change to be a naked neck. It is in a third set of receptors that is set in the first 7 days of the embryos life. It is an extra chunk of BMP 12, so I guess that if a duck gets that extra chunk of DNA that would cause it to have the naked neck. The cells that are responsible for feather production do not adhere to the neck when that extra DNA is present, I have not heard of someone getting that abnormality in a duck and then breeding for it. Never even heard of a duck being born that way, though I can imagine it must have happened somewhere.