A ground feeder ring is provided for use with round bales of hay positioned on the ground in the field for feeding the hay to horses with a minimum of waste. The feeder ring is preferably assembled in the field around a previously positioned round hay bale and is formed from several individual ring segments that, when assembled, define a ring encircling the bale. Each ring segment is formed with corresponding overlap regions at the respective ends thereof with fastener openings formed therein to permit the connection of adjacent ring segments. The assembled ring prevents horses from accessing the bottom portion of the round bale that causes waste of the hay, thus reducing feeding costs. The ring segments can be manufactured from plastic formed during a rotational molding process to provide a durable double wall, lightweight device that can be easily transported and assembled in the field.