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1.5kg of Mixed Corn.
Lots of poultry keepers feed mixed poultry corn as a main staple diet for chickens but i really would suggest this should not be the case.
I recommend that one handful of this is fed to 6 birds per day normally in the afternoon so it keeps the crop full at night. In the colder weather it should be increased to 1.5 handfuls a day for 6 birds.
Birds do enjoy scratching for this so throw it for them rather than in a dish.