We have 43 Indian Runner X Mallard ducks, 5 Paradise Shelducks 1 Brown Shaver rooster to X with my 5 Bardrock X Leghorn hens who are freerange, and I mean FREERANGE. I havn't fed them anything at all in about 3months, yet they are the healthyest, fattest, shinyest chooks around. They have a wormfarm to pek and scratch in, dustbath areas, a bumper crop of rye and other seeding grasses, plenty of bugs and small fish to eat and maggots from the rotting possum carcases that I sometimes hang above their nesting area. And 1 Turkey who is a darling. All birds are happy and the eggs and excess roosters are yummy. Moonflower, the boardercollie rounds them up when needed or if she gets bored.
You can lead a dog to water, but you can't make him a horse.