mottling

The feathers sorta look like this and they are only on it's chest. Its mother is a blue mottled belgian d'uccle, and its father is a black silkie. There are also 4 others out of the same mother/father who dont have anything like this. Besides that the father has also been crossed to another...

Hey! so I have a lot of questions about mottling and some other genetic related questions. Thank you in advance for reading and also thanks for any answer i get! 1.Is there any way to be sure a specific breed/color has the mottling factor (for example could be mille fleur or something else)...