Since I've now had this crop up in this year's hatch, I've been doing a little research. Since I have two parents, neither of whom have feathered legs, then this must be the more rare recessive version of a feathered leg gene, Pt3.
And, since it is recessive, it is present in the cock and at least one of the hens in my breeding pen. But, where did this originally come from? The birds I tend to think of as having feathered legs, like the Brahma, have the dominant version, PT 1 or PT 2.
So what bird was used in the development of the wheaten/blue wheaten that introduced this gene?