A livestock feeder with improved corrosion resistance and collapse resistance is described. The feeder comprises a polymeric cylinder with an open top and an interior surface. The interior surface defines a hollow interior where feedstuffs can be placed. One or more feeding portals extend through the cylinder to provide livestock access to feedstuffs. The feeding portals include a lower ledge against which livestock exerts a force while accessing feedstuffs in the feeder interior. A reinforcing annulus extends around the interior surface of the feeder proximate to and below the lower feeding portal ledge. The reinforcing annulus may be integrally formed with the polymeric cylinder or separately formed and attached to the polymeric cylinder. The feeder can withstand repeated feedings without collapse.