Dose and release pattern of anabolic implants affects growth of finishing beef steers across days on feed
dc.creator | Parr, S.L. | |
dc.creator | Chung, K.Y. | |
dc.creator | Hutcheson, J.P. | |
dc.creator | Nichols, W.T. | |
dc.creator | Yates, D.A. | |
dc.creator | Streeter, M.N. | |
dc.creator | Swingle, R.S. | |
dc.creator | Galyean, M.L. | |
dc.creator | Johnson, Bradley J. | |
dc.date.accessioned | 2021-08-31T20:59:05Z | |
dc.date.available | 2021-08-31T20:59:05Z | |
dc.date.issued | 2011 | |
dc.description | This article is available under the Creative Commons CC-BY-NC license and permits non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited. | en_US |
dc.description.abstract | Four experiments evaluated the effect of implant dose and release pattern on performance and carcass traits of crossbred beef steers. In Exp. 1, steers (4 to 7 pens/treatment; initial BW = 315 kg) were fed an average of 174 d. Treatments were 1) no implant (NI); 2) Revalor-S [120 mg of trenbolone acetate (TBA) and 24 mg of estradiol 17β (E2); REV-S]; 3) Revalor-IS followed by REV-S (cumulatively 200 mg of TBA and 40 mg of E2; reimplanted at 68 to 74 d; REV-IS/S); and 4) Revalor-XS (200 mg of TBA and 40 mg of E2; REV-X). Carcass-adjusted final BW was greater (P < 0.05) for REV-X and REV-IS/S than for REV-S (610, 609, and 598 kg, respectively). Daily DMI did not differ (P > 0.10) among the 3 implants, but carcass-adjusted G:F was greater (P < 0.05) for REV-X and REV-IS/S than for REV-S (0.197 and 0.195 vs. 0.188). Both HCW and LM area were greater (P < 0.05) for REV-X and REV-IS/S than for REV-S. Marbling scores were greatest (P < 0.05) for REV-S and least (P < 0.05) for REV-IS/S; REV-X was intermediate to NI and REV-IS/S. In Exp. 2, steers (10 pens/treatment; initial BW = 391 kg) were fed 131 d, with treatments of REV-S, REV-IS/S (reimplanted at 44 to 47 d), and REV-X. Carcass-adjusted final BW (598 kg), ADG (1.6 kg), DMI (9.4 kg), G:F (0.17), and HCW did not differ (P > 0.10) among treatments. The percentage of Choice was less (P < 0.05) and percentage of Select greater (P < 0.05) for REV-IS/S than for REV-S and REV-X. In Exp. 3, steers (10 pens/treatment; initial BW = 277 kg) were fed 197 d and received either REV-IS/S (reimplanted at 90 to 103 d) or REV-X. Carcass-adjusted final BW (625 vs. 633 kg) and ADG (1.81 vs. 1.76 kg) were greater (P < 0.05) for REV-X-implanted steers. Daily DMI did not differ, but G:F tended (P < 0.10) to be increased and HCW was greater (P < 0.05) for REV-X than for REV-IS/S. In Exp. 4, steers (8 pens/treatment; initial BW = 238 kg) were fed 243 d and received either REV-IS/S (reimplanted at 68 to 71 d) or REV-X. Carcass-adjusted final BW (612 kg), ADG (1.54 kg), DMI (7.55), and G:F (0.21) did not differ (P > 0.10) for REV-IS/S and REV-X-implanted steers. Carcass traits did not differ among implants, but the percentage of Choice carcasses was greater (P < 0.05) and percentage of Select was less (P < 0.05) for REV-X than for REV-IS/S. These data indicate that when TBA/E2 dose is equal, the altered release rate of REV-X can improve performance and quality grade, but these effects depend on duration of the feeding period and timing of initial and terminal implants. | en_US |
dc.identifier.citation | S. L. Parr, K. Y. Chung, J. P. Hutcheson, W. T. Nichols, D. A. Yates, M. N. Streeter, R. S. Swingle, M. L. Galyean, B. J. Johnson, Dose and release pattern of anabolic implants affects growth of finishing beef steers across days on feed, Journal of Animal Science, Volume 89, Issue 3, March 2011, Pages 863–873, https://doi.org/10.2527/jas.2010-3447 | en_US |
dc.identifier.uri | https://doi.org/10.2527/jas.2010-3447 | |
dc.identifier.uri | https://hdl.handle.net/2346/87788 | |
dc.language.iso | eng | en_US |
dc.subject | Beef Steer | en_US |
dc.subject | Estradiol-17β | en_US |
dc.subject | Trenbolone Acetate | en_US |
dc.title | Dose and release pattern of anabolic implants affects growth of finishing beef steers across days on feed | en_US |
dc.type | Article | en_US |
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