I hatched out silkies almost three weeks ago and they are just getting to large fowl 'chick' size - most aren't even as big as day old LF chicks, although a few are close. I'm (hopefully) doing a hatch of standard large fowl in another week. Assuming the silkies and the LF chicks are about the same size, which I think would happen when the LF chicks are a week or two old, would integrating them cause problems due to the month's head start of maturity in the silkie chicks? Or is it just size that matters? <evil grin>.