The objective of this Univ. of Nebraska study was to determine if delaying the initial feedlot implant would influence performance and carcass traits in steer calves implanted twice during the finishing period. One hundred crossbred steer calves (476 lb) were used in the study. One-half were implanted with Synovex S® after a 14-day acclimation period. The remainder were implanted with Synovex S® 30 days after the 14-day acclimation period. All calves were re-implanted 112 days later with Synovex Choice® and harvested after another 100 days. Average daily gain (3.74 lb/d), final wt. (1269 lb), hot carcass wt. (799 lb), fat thickness (.48 in.), ribeye area (12.79 sq. in.), and yield grade (3.2) were not affected by implant regimen. However, the delayed implant steers had significantly higher marbling scores (570 vs. 527) and a higher percentage grading Choice (92 vs. 68%). The authors concluded that delaying the administration of Synovex S® until 30 days on feed can improve marbling score and quality grade without compromising feedlot performance (Funston et al. 2004. Univ. of Nebraska Beef Cattle Report. MP80A).