 Oklahoma National Stockyards, 2,700 head Monday. Steering heifer calves were 4 to 8 higher. A few head of up to 15 higher. And even with the holiday week and hot temperatures, buyer were very aggressive on Monday. Feeder cattle steers, medium to large ones, 3 weights, 389. 4 to 5 weights, 319 to 359. 5 to 6 weights, 281 to 347. 6 to 7 weights, 268 to 305. 7 to 8 weights, 246 to 282.