SIOUX FALLS, S.D., May 24 (UPI) -- Monday's Sioux Falls livestock report: Cattle: 150 Slaughter steers and heifers not well tested, firmer undertone. Cows not well tested, few steady. Slaughter Steers: Select, few Choice, 2-3 1296-1364 lbs 63.10-64.00. Slaughter Heifers: Select, few Choice, 2-3 1096-1340 lbs 63.50-64.10. Hogs: 1,000 Barrows and gilts steady. Percent Lean Weight Price 48-51 220-270 lbs 36.00-36.50 46-48 270-280 lbs 35.00-36.00 280-290 lbs 34.00-35.00 290-300 lbs 33.00-34.00 Sows 300-450 lbs steady to .50 lower, 450-500 lbs mostly 1.00-1.50 higher, 500-700 lbs mostly steady. US 1-3 300-450 lbs 33.00-33.50 450-500 lbs 36.00-36.50 500-700 lbs 38.00-40.00  