Okay, that makes sense. I just read it wrong.
And I would NOT mix the scratch with their food since all they'll do is peck at it to get the scratch and leave the healthy food.
The only time I give scratch grains is when I want them to COME to me or if I have an area in my garden that I need...
I have both d'Uccles and Silkies and have never had a problem with either.
You say they have access to "scratch."
Do you mean "grit?"
They really don't "need" scratch; but if you have no small pieces of rock in your soil, they should be supplied with some extra grit.
My Silkies and...