TouchéI find it very effective.
No healthy animal will starve itself in the presence of food.
Also, consider the design of your feeder. I find that my traditional, metal hanging feeder with the deep pan and the good rolled rim is almost completely spill-proof if hung at the height of the chickens' backs.
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The plastic feeders, not so much.
A plate of cookies usually vanishes faster than a plate of veggie sticks.![]()