who indicated no significance among RAC fed กลุ่มทรีสเม้น for CL with finishing swine. However, Watkins et al. (1990) and Yen et al. (1990) both reported shorter carcasses with the inclusion of RAC in finishing swine diets. The reduction in carcass length can be explained by more nutrients being devoted to protein accretion than to osteogenesis due to the chemical action of ractopamine. The effect of RAC on carcass length maybe more pronounced during the finishing phase than the growing phase. However, the results from the previous studies were reported during the finishing phase.