Effect of increasing initial implant dosage on feedlot performance and carcass characteristics of long-fed steer and heifer calves

Abstract

Three experiments evaluated initial implant strategies for finishing cattle. In Exp. 1, heifers (n. =. 1,405; initial BW. =. 282 kg) were given (1) Revalor-IH followed by Revalor-200 (REV-IH/200), (2) Revalor-H followed by Revalor-200 (REV-H/200), or (3) Revalor-200 followed by Revalor-200 (REV-200/200). Intake, ADG, and G:F were not affected (P. >. 0.14) by implant strategies, nor were HCW and LM area (P. >. 0.16). Percent USDA Choice was greater (P.. 0.32) DMI or G:F. Carcass traits were not different (P. >. 0.18) among treatments, except steers implanted with Rev-XS/200 had greater (P.. 0.36) among the 3 implant strategies, nor did HCW or marbling score (P. >. 0.15). Steers given Rev-XS/200 had greater (P.