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A total of 934 barrows and gilts (PIC 337 × 1050, initially 240 lb) were used in a 26-d experiment to evaluate the effect of different Ractopamine HCl (RAC) feeding programs on growth and carcass traits of finishing pigs. Treatments included a basal diet with (1) no RAC for 26 d (control), (2) 7.5 ppm RAC for 26 d (constant), (3) 5 ppm RAC for d 0 to 14 and 10 ppm for d 14 to 26 (step-up), and (4) RAC concentration increased daily from 5 ppm on d 0 to 10 ppm on 26 d by using the FEEDPro (Feedlogic Corp., Willmar, MN) system (curve). Each treatment had 10 pens with a similar number of barrows and gilts in each pen. From d 0 to 14, pigs fed diets containing RAC had greater (P < 0.001) ADG and better (P < 0.001) F/G than those fed the control diet. Pigs fed the constant or step-up RAC feeding methods had greater (P < 0.04) ADFI compared with those fed the control diet. From d 14 to 26, all RACfed pigs had greater (P < 0.001) ADG and better (P < 0.001) F/G than control pigs.

Evaluation of Ractopamine HCl feeding programs on growth performance and carcass characteristics of finishing pigs