Response to AminoGain supplementation in beef steers is not influenced by dietary energy level during the growing or finishing phase



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The effects of supplementing ruminal bypass amino acid supplement AminoGain® (AG; ADM Alliance Nutrition, Quincy, IL) to steers fed varying dietary energy levels during the growing and finishing phases on growth performance and carcass characteristics was evaluated. Crossbred steers (n = 192; initial BW = 306 ± 26.5 kg) were blocked by BW and assigned randomly to one of six treatments: 0.88 Mcal/kg NEg growing ration and 1.39 Mcal/kg NEg finishing ration, with/without AG (Low/ModAG; Low/ModCTL); 1.17 Mcal/kg NEg growing ration and 1.39 Mcal/kg NEg finishing ration, with/without AG (Mod/ModAG; Mod/ModCTL); 1.34 Mcal/Kg NEg growing ration and 1.59 Mcal/Kg NEg finishing ration, with/without AG (High/HighAG; High/HighCTL). Supplements consisted of 0.45 kg/hd/d of urea-based supplement (CTL) or 0.45 kg/hd/d AG. Growing period final BW was 7 kg heavier for CTL versus AG (P = 0.03); likewise, growing period G:F was 7% greater for control versus AG (P < 0.01). Feed intake tended to increase from d 0-28 for AG (P = 0.07). Low-energy growing treatments had 11% and 15% higher DMI, respectively, than moderate and high-energy growing treatments (P < 0.01); consequently, growing period G:F was greater with increasing dietary energy density (P < 0.01). Ribeye area tended to increase with AG supplementation (P = 0.07). High energy finishing treatments had lower overall DMI and greater overall G:F (P < 0.01). Response to supplementation of AG was not impacted by dietary energy level and did not enhance growth performance or carcass characteristics in this study.



Amino acids, Energy, Finishing beef cattle, Growing beef cattle