estradiol, trenbolone acetate, steers, carcass quality
Two hundred seventy-seven crossbred yearling steers (719 Ib) were utilized in a 3-year study to determine the effect of combinations of Synovex-S and Finaplix-S on daily gain and carcass merit. Treatments included no implant (C), implanted with Synovex-S on day 1 and Synovex-S on about day 60 (SS), and implanted with Synovex-S on day 1 and the combination of Synovex-S and Finaplix-S on about day 60 (SSF). In year 1, all steers were slaughtered after 124 days on feed. In year 2, steers were slaughtered after 120, 134, or 148 days on feed. In year 3, steers were slaughtered after 121, 140, or 156 days on feed. Implanting increased (P<.001) average daily gain by 19.9% (4.00 vs 3.34 Ib per head daily). Cattle implanted with the combination of Synovex-S and Finaplix-S gained weight more rapidly (P<.05) than cattle implanted only with Synovex-S (4.08 vs 3.93 1b per head daily). Implanted steers had heavier (P<.01) hot carcass weights, larger rib eye areas (P<.01), lower (P<.05) marbling scores, and more (P<.01) fat over the 12th rib than nonimplanted steers. There were no significant differences in any of the carcass traits between implants. Percentage choice carcasses were 76.6, 73.0, and 75.2 for the C, SS, and SSF treatments, respectively. One time use of the combination of Finaplix-S and Synovex-S with a minimum of 60 days prior to slaughter did not reduce carcass marbling score or quality grade.
Number of Pages
South Dakota State University
Copyright © 1992 South Dakota State University.
Wagner, J. J. and Pritchard, R. H., "Combination of Synovex-S¹ and Finaplix-S² for Yearling Steers" (1992). South Dakota Beef Report, 1992. 9.