Having the pigs dump their food and fight over it is often a problem. Also, in a rotational grazing setting, I wanted to make some kind of feeder that would be stable, reduce competition, and also be easy to relocate when I shift the animals to a new paddock. These feeders worked very well for me, in general.
Commercially available finger weeders made by Kress, Buddens, etc. are vastly overpriced.
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