Evaluation of Revalor® implants for stocker-finishing steers

Date

2010-11-02

Journal Title

Journal ISSN

Volume Title

Publisher

Kansas State University. Agricultural Experiment Station and Cooperative Extension Service

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.

Description

Keywords

Beef, Revalor, Steers, Growing, Finishing, Performance, Carcass traits

Citation