Making Tolbunt Orps would be pretty easy actually, just cross a Gold Laced male over Mottled females. On GF's blog they mention using Jubilees... I'm wondering if they're opting to do this because they don't have access to Mottled birds or if they are hoping to deepen the base color of the future Tolbunts using the Mahogany influence from the Jubes.
The resulting chicks would all be partially laced, split to (recessivly carrying) the gene for mottling. You'd then cross the offspring together to end up with a percentage of chicks pure for the Mottling gene, having a 1 copy from each parent allowing them to physically express the color, a.k.a show their spots. From that point on it's just about refining and breeding for better and better gold lacing in the birds. Outcrossing to pure Gold Laced Orps would be one way to do this, but then you would have to work on bringing the Mottling gene back again.
In a nutshell, it's going to be a looooong project but the resulting birds will be gorgeous!
The resulting chicks would all be partially laced, split to (recessivly carrying) the gene for mottling. You'd then cross the offspring together to end up with a percentage of chicks pure for the Mottling gene, having a 1 copy from each parent allowing them to physically express the color, a.k.a show their spots. From that point on it's just about refining and breeding for better and better gold lacing in the birds. Outcrossing to pure Gold Laced Orps would be one way to do this, but then you would have to work on bringing the Mottling gene back again.
In a nutshell, it's going to be a looooong project but the resulting birds will be gorgeous!