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In a commercial feedyard trial, 242 Holstein steer calves averaging 378 lb were used to compare effects of six alternative implant programs, consisting of sequential use of Synovex-S® or a combination of estradiol and trenbolone acetate (Revalor-S® or FinaplixS® plus Synovex-S®), on feedlot performance and carcass characteristics. The calves were implanted three times at 78to 90-day intervals while on feed an average of 252 days. The combination implant increased (P<.05) gain by .13 to .21 lb per day in all three implant periods compared to Synovex alone. Total feedlot gain was increased in direct relation to the number of times steers received the combination implant. However, marbling score and the percentage of carcasses grading USDA Choice tended to be reduced with repeated use of Revalor or Finaplix.

Sequential implant strategies with Synovex-S® and trenbolone acetate-containing implants in calf-fed holstein steers