Your silkies main diet should be a standard chicken feed.
They should have grit or coarse sand available to them all the time
if you are gonna feed them anything else. Scratch is like candy to
a chicken. They love rice, pasta, vegies, and just about anything
you eat. Again, as long as they have grit available all is well.
My silkies eat chicken. They love picking all the goodies off a fried
wing or drumstick.