A greater dose of ractopamine hydrochloride enhances feedlot performance and impacts carcass characteristics of calf-fed holstein steers

Jerilyn E. Hergenreder, Jonathon L. Beckett, Zachary K. Smith, Bradley J. Johnson

Research output: Contribution to journalArticlepeer-review

Abstract

The objective was to evaluate the effects of supplementing ractopamine HCl at the rate of 400 mg steer-1 daily in the final 28 d of the feeding period on growth performance and carcass characteristics of Holstein steers. Steers (n = 1,498; initial BW = 547 kg) were randomly assigned to pens (10 pens/treatment) and to a treatment: (1) 0 mg∙steer-1∙d-1 of RH (CON); (2) Ractopamine HCl fed at 400 mg∙steer-1∙d-1 of RH (RH) for evaluation over a 28 d period. Steers were fed a finishing diet based on steam-flaked corn and alfalfa hay. Dry matter intake decreased, Average Daily Gain (ADG) was increased and improved feed efficiency (P<0.05) was noted in RH steers. Steers supplemented with RH had heavier final Body Weight (BW) and HCW, greater Dressing Percentage (DP) and larger Longissimus Muscle (LM) area (P<0.05). Ractopamine HCl steers had improved yield grades, as evidenced by a greater percentage of yield grade 1 and a decreased percentage of yield grade 3 (P<0.05) carcasses. Steers supplemented RH had a decreased percentage of cattle grading USDA Choice and a greater percent grading USDA Select (P<0.05). These data indicate that 400 mg∙steer-1 daily of ractopamine HCl fed to Holstein steers may improve feedlot phase growth performance, DP, HCW and LM area while having minimal impact on USDA quality grade distribution.

Original languageEnglish
Pages (from-to)99-104
Number of pages6
JournalAmerican Journal of Animal and Veterinary Sciences
Volume16
Issue number1
DOIs
StatePublished - 2021

Keywords

  • Beta-Adrenergic Agonist
  • Carcass Grade
  • Feedlot Growth Performance
  • Holstein Steer
  • Ractopamine Hydrochloride

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