Effects of Revalor-G®, R®algro, and Synovex-H® on the performance of stocker heifers grazing irrigated rye pasture

Effects of Revalor-G®, R®algro, and Synovex-H® on the performance of stocker heifers grazing irrigated rye pasture Kuhl, Gerry L.; Blasi, Dale A. A 151-day field study was conducted to compare three anabolic implants for promoting weight gain in stocker heifers grazing center pivot-irrigated pastures of winter rye. Three hundred previously nonimplanted heifers averaging 421 lb were allotted to one of four treatments: 1) no implant-control (NC), 2) Ralgro® (RAL), 3) Revalor-G® (REV-G) and 4) Synovex-H® (SYN-H). Heifers were weighed at monthly intervals to evaluate the growth response curve of each implant type over time relative to controls. Only during the first 32-day period after implantation did heifers implanted with REV-G gain significantly faster (P<.05 than nc. all implant groups responded similarly>.05) during the next three monthly weigh periods. During the last period (day 124- 151), SYN-H heifers gained faster (P<.05 than all other treatments. over the entire study daily gains averaged as follows: nc ral rev-g and syn-h implant types except significantly improved gain compared to nc. although no significant difference>.24) occurred between RAL and REV-G, SYN-H-implanted heifers. gained faster (P<.05 than the other implant groups over grazing season.>