Abstract
ABSTRACT The objective was to evaluate varying doses and durations of ractopamine hydrochloride (RAC; Paylean, Elanco Animal Health, Greenfield, IN) on growth performance and carcass characteristics. Finishing pigs were allotted to 12 treatments 35 d before market. Treatments consisted of negative control [NEG; 13.13% CP, 0.64% standard ileal digestible (SID) Lys] and positive control (POS; 17.77% CP, 0.94% SID Lys); and 2 RAC diets (5 or 7.4 mg/kg) that were fed for the last 7, 14, 21, 28, or 35 d before market. No differences (P > 0.05) were observed between 5 and 7.4 mg/ kg of RAC; therefore, the 2 doses were pooled and compared with the NEG and POS diets. Feeding RAC (pooled average for the RAC groups) increased (P = 0.004) final BW by ~ 3 kg, overall ADG by 12% (P
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