Sep 01, 2011 · Michigan State University beef researchers compared alfalfa and orchardgrass hay waste from four round-bale feeder designs using 1,388-lb. pregnant beef cows with an average BCS of 5.9. The bale feeder designs and percent hay waste were: Tapered-cone, 3.5%, Ring, 6.1%, Rectangular trailer, 11.4%. Stationary rectangular cradle, 14.6%.