Growing steers and bulls, were received in 3 blocks (Block 1, n = 150, BW = 208 ± 12.4 kg; Block 2, n = 99, BW = 213 ± 16.7 kg; Block 3, n = 149, BW = 219 ± 14.9 kg) to evaluate the effects of supplying 20 mg of bambermycin (Gainpro; Huvepharma, Inc., Sofia Bulgaria) or 0.77 mg/kg BW monensin (Rumensin; Elanco Animal Health, Indianapolis IN) in receiving supplements (20% CP and 78% TDN) compared with non-medicated supplements (Control) on cattle morbidity, performance, and coccidia infection. Upon receiving, bulls were castrated, and calves were weighed on 2 consecutive days. Calves were then stratified by BW and arrival castrate status and randomly allocated to receiving pens (n = 12–0.4 ha pens in Block 1 and n = 6 pens in Blocks 2 and 3). Calves received 0.9 kg of supplement daily and ad libitum access to moderate quality hay. Fecal samples were collected from 6 steers/pen on d 0, 14, and 28 to evaluate coccidia infection. Water in the Gainpro pens was treated from d 14 to d 19 with 10 mg/kg BW amprolium (Corid; Merial, Duluth GA). Steers remained on treatment for 56 to 84-d for Block 1, 49-d for Block 2 and 42-d for Block 3. Data were analyzed as a randomized complete block design using the mixed procedure of SAS (SAS Inst. Inc., Cary, NC). Cocci counts were log-transformed before analysis as a repeated measure in time. There were no differences (P ≤ 0.36) in morbidity, mortality, or animals identified as chronically morbid. There was no treatment by day interaction (P = 0.12) for cocci oocysts counts, and monensin decreased coccidia (P ≤ 0.03) compared with Control and bambermycin, which did not differ (P = 0.85). No cattle were observed with or treated for symptoms of coccidiosis (bloody scours and diarrhea). At the end of receiving, BW and ADG for Control (237 ± 5.1 kg/steer and 0.49 ± 0.272 kg/d, respectively) was less than (P ≤ 0.04) bambermycin (243 ± 5.1 kg/steer and 0.60 ± 0.272 kg/d) and monensin (247 ± 5.1 kg/steer and 0.68 ± 0.272 kg/d), and monensin tended (P ≤ 0.10) tended to be greater than bambermycin. The results of this experiment indicate both bambermycin and monensin increased receiving cattle gain performance compared with Control, and monensin also provided greater benefits in reduction of coccidia counts.