Like another said, it was made to cut the bundles of the entire corn plant, and blow it into a silo, for cattle feed. Not chickens. Common in early half of the last century. Dad didn"t want to pay custom charges in the 50s, so bought one and we used it for a few years. I bought one on auction in the 90s, for $5, with a few feet of pipe and the gooseneck that goes into the silo. Nice tractor show piece.
Lotsa labor involved using one....cutting bundles in the field with a corn binder, loading onto wagons, feeding into the cutter.