Abstract

Revalor® implants (containing trenbolone acetate plus estradiol) were evaluated in a grazing-finishing system using steers with a known previous implant history. Grazing gains were not improved by either Ralgro® or Revalor implants, suggesting that previously implanted steers may not respond to implants during a later growing phase. During the finishing phase, steers implanted with Revalor gained 5.4 to 8.0% faster (P<.05) than steers implanted with Synovex-S®. Gain efficiency in the finishing period was improved 4.8% (P<.10) for steers receiving no pasture implant and a Revalor implant during the finishing phase (0R), compared with steers receiving Ralgro/Synovex (RS) or Revalor/Revalor (RR) implants in the pasture/feedlot phases. Steers implanted with RR had larger (P<.05) ribeye areas than RS steers, with 0R steers intermediate. However, RR steers had a 20 percentage unit reduction (P<.05) in carcasses reaching the choice grade compared to RS steers. Revalor can improve steer feedlot performance, but multiple implantation may reduce quality grade.

Keywords: Cattlemen's Day, 1991, Kansas Agricultural Experiment Station contribution, no. 91-355-S, Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service), 623, Beef, Revalor, Steers, Growing, Finishing, Performance, Carcass traits

How to Cite:

Brandt, R. T., Jr., Grant, R. & Pope, R. V., (1991) “Evaluation of Revalor® implants for stocker-finishing steers”, Kansas Agricultural Experiment Station Research Reports 1(1), 86-89. doi: https://doi.org/10.4148/2378-5977.2224