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Effects of feeding Next Enhance in finishing diets on performance and carcass characteristics

Tuesday, March 18, 2014: 3:45 PM
304-305 (Community Choice Credit Union Convention Center)
Curtis J. Bittner , University of Nebraska-Lincoln, Lincoln, NE
Galen E. Erickson , University of Nebraska-Lincoln, Lincoln, NE
Karla H Jenkins , University of Nebraska, Scottsbluff, NE
Matt K. Luebbe , University of Nebraska, Scottsbluff, NE
Martin A. Andersen , Novus International, Inc., St. Charles, MO
Recorded Presentation (flv) Audio File
Abstract Text:

A feedlot study evaluated the effects of increasing NEXT ENHANCE (NEXT) essential oils in finishing diets containing monensin and tylosin on animal performance and carcass characteristics.  Three hundred and sixty calf-fed steers (BW = 301 ± 28 kg) were utilized in a randomized block design (n=3 BW blocks) experiment.  Treatments consisted of feeding NEXT at rates of 0, 75, 150, 225, and 300 mg/steer daily.  Monensin and tylosin were provided in all treatments at 360 and 90 mg/steer daily, respectively.   A common basal diet consisted of 65% dry-rolled corn, 25% wet distillers grains plus solubles, 5% wheat straw, and 5% supplement (DM basis).  Steers were fed for 141, 169, or 174 d, depending on BW block.  Animal performance and carcass characteristics were analyzed using the MIXED procedure of SAS with pen as the experimental unit.  As rate of NEXT in the diet increased, DMI decreased linearly (P = 0.04).  Greatest reductions in intake were observed when steers were fed NEXT at 225 and 300 mg/steer daily, which resulted in a 4.6% and 2.8% reduction in DMI, respectively, compared to cattle fed 0 NEXT.  Feeding increasing rates of NEXT did not affect ADG (P = 0.77; linear) or final BW (P = 0.75; linear).  Feed efficiency increased linearly (P < 0.02) as rate of NEXT in the diet increased.  Compared to the 0 treatment, feeding NEXT at 225 and 300 resulted in 4.4% and 3.8% improvement in G:F, respectively.  Hot carcass weight, dressing percent, marbling score, and LM area were not different (P > 0.18; linear or quadratic) among treatments.  A trend was observed for calculated yield grade to decrease linearly (P = 0.11) as rate of NEXT increased due to a linear (P = 0.02) decrease in 12th rib fat.  There was also a trend for an increased (P= 0.11; linear) incidence of liver abscesses with increasing rates of NEXT.  These data suggest feeding NEXT ENHANCE decreases DMI without impacting ADG, resulting in improved G:F.  Greatest improvements in G:F were observed when NEXT was included at 225 and 300 mg/steer daily in feedlot finishing diets containing monensin and tylosin.

Keywords: beef cattle, essential oil, feedlot performance

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