How many do you need to feed?
We made these, 4"PVC elbows, faced down into a galvanized garbage can. Buy feed, dump feed, done touching feed until next feed run. We also have wall mounted PVC tubes for pens without many birds.
We set the can in the middle of the pen, with 4 ports, one on each side. If a bird wants to guard an opening, it can't see the one on the other side and the submissive birds still have a spot to eat from.
A LOT less spillage/waste. They do a much better job at cleaning up whatever they do spill. Since they like to scratch and the feeder can't be scratched, they scratch in front of the port and clean up what they did toss out. We don't feed layer feed, so I also sprinkle oyster shell on the ground in front of each port.
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The feed stays as fresh as it would in a can for storage, we let them eat it until empty, to avoid the potential for mold/fungus in the bottom from old feed. We aim to refresh it once every two weeks, based on how many birds are in the pen is if it gets a half bag or 2 full bags. It's good for either 25 pounds all the way up to 100 pounds.
We did one for the Turkeys too, propped up on 2 cinder blocks (next to each other) to account for their height. For chicks I use the hanging type plastic feeders, size based on age. The grow outs can't start using the PVC elbows until they're tall enough and their necks are long enough, around 12-14 weeks old.