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Not sure why, perhaps partly because it can be hard to breed for if it doesn't yet exist in a breed. It's hard because it requires many genes- something simple seeming like lacing is actually due to several different genes(Pg,Co, Ml, Db etc). The more genes you want in a single animal, the harder it is to breed for. Mottle is yet another gene.. so that's at least 5 genes you want in same bird.. plus 6 if you also want Na(naked neck)..... It's a little easier if the breed already has lace and mottle.. both are not standard colors in NN so they have to be made from scratch. A challenge for sure! I am working on lacing, would be too much trouble to add mottle right now.. but will be very happy if mottle/tolbunt shows up later in the line from this silver laced hen.....
Tolbunt breeds true once you have all the necessary genes. Still a bit of challenge, have to select for good lacing plus the right amount of 'mottle'. The tolbunt name applies regardless of breed- it is the name of genetic combination of Gold laced plus Mottle. Same idea as Barred.. it's a gene combination of Barring on a solid black bird.. so that is why barred cochin, barred turken etc is perfectly acceptable.