steer, estradiol, trenbalone, acetate, feedlot
One hundred twenty-three yearling black baldy steers were fed in one pen for 123 days at a commercial feedlot near Kimball, South Dakota. On day 1 in the feedlot, 53 steers were implanted with Synovex-S, 53 steers were implanted with the combination of Synovex-S and Finaplix-S and 17 steers received no implant. On day 60 in the feedlot, 18 of the Synovex-S steers and 18 of the combination steers were reimplanted using Synovex-S. Also on day 60, 18 of the Synovex-S steers and 18 of the combination steers were reimplanted using the combination of Synovex-S and Finaplix-S. The remaining steers were not reimplanted. Average daily gain, carcass weight, rib fat thickness, rib eye area and numerical yield grade were increased (P<.05) while marbling score and the percentage of cattle grading Choice were reduced (P<.10) for implanted steers as compared with nonimplanted steers. Steers implanted on day 1 with the combination gained faster (P<.0246) and exhibited larger (P<.0168) rib eyes than steers implanted on day 1 with only Synovex-S. Reimplanting on day 60 did not significantly improve average daily gain above day 1 implanting only. Percentage of implants found in acceptable position with no infection or encapsulation 2 wk postimplanting was 85.31 for Synovex-S and 60.23 for Finaplix-S.
Number of Pages
South Dakota State University
Copyright © 1989 South Dakota State University
Wagner, J.J.; Pritchard, R.H.; Thomson, J.U.; and Goetz, M.J., "Combinations of Synovex and Finaplex for Yearling Steers" (1990). South Dakota Beef Report, 1990. 10.