Feeding a mixed flock?

[Shelbycobra]

I will soon be adding ducklings to my chicken flock. The books say not to feed ducklings medicated feed, so I bought non medicated Turkey feed and Brewers yeast for niacin supplementation.
When they are all in the same run what do you feed your mixed flock of young birds?

Thanks

 

[gritsar]

Purina makes a feed called Flock Raiser. Other companies probably have a similiar product. You can feed it to all of them.