LAUSR

© The Board Regents of the University of Nebraska. All rights reserved. administered at 5.5 ml/steer, and Somubac (Zoetis Animal Health) administered at 2 ml/steer. Steers received a limit fed diet and were trained to the Calan gate system for 27 d prior to trial initiation. During processing on d 0, all steers were individually weighed, and revaccinated with Bovishield Gold One Shot (Zoetis Animal Health) administered at 2 ml/steer and Ultrabac® 7 (Zoetis Animal Health) administered at 5 ml/steer. Steers also received a Ralgro® (36 mg Zeranol; Merck Animal Health) implant on d 1. Prior to initiation of trial, steers were limit fed at 2% of BW a diet consisting of 50% Sweet Bran® (Cargill) and 50% alfalfa hay (DM basis) to minimize variation in gastrointestinal fill. Steers were weighed for 3 consecutive d to establish initial BW. Steers were blocked by d1 and d 0 BW, stratified by BW within blocks (light and heavy), and assigned randomly to 1 of 4 treatments (n = 30). Block was assigned to field based off d1 and d 0 weights (irrigated = heavy block, dryland = light block) with 60 steers per field. Steers grazed the same field assigned at initiation for the duration of the trial. All steers were individually supplemented daily via a Calan gate system. Minerals and vitamins were added to supplements to meet nutrient requirements (Table 1). Monensin (Rumensin, Elanco Animal Health) was included in the supplement to provide 200 mg/steer daily. At the Steer Performance Grazing Corn Residue and Supplemented with Modified Distillers Grains plus Solubles with or without Urea