Last year I got advice from a neighbor who raises chickens, geese and ducks and that's all he fed his group, so until I got back onto this site, that's what I was feeding my birds. No more. But I do throw out a handful or two to my water birds in the morning so they'll get out of my way when I tend to the chicken and fill their waterer, and occasionally I'll throw a handful or two in the late afternoon to get them out from underfoot. and I admit, they get a couple more small handfulls in the evening--which guarantees they'll go into their nighttime enclosure with no trouble.
I have 11 waterbirds, 7 adult chickens and 19 8wo baby chicks. I figure that I toss out somewhere between one and two cups a day for 37 birds. The chickens all get complete feeds from bedtime until late afternoon when we let them out to run, and the waterbirds free range all day. I have also fed them layer feed from time to time to supplement, and they get all of the weeds I pull from my garden.
They LOOOVE scratch, so it's a nice enticement, and by tossing out a couple hand fulls over a broad space, it takes them quite a while to eat it all--as I said, getting them out of my hair if I'm spending an extended period of time out in the pasture area with them, since my gander can be quite bossy and bite if he thinks I'm in the way. Oh, and it distracts them nicely when I go to give a complete feed to my Muscovy hen who is sitting on a clutch right now--otherwise the other birds steal it all from her.