NUTRITION: Original Research| Volume 36, ISSUE 5, P668-676, October 2020

Download started.


Effects of intake of monensin during the stocker phase and subsequent finishing phase on performance and carcass characteristics of finishing beef steers



      Use of monensin during the stocker phase of production has been suggested as a possible cause of reduced response to monensin during finishing. Experiments were conducted to determine the carryover effects of monensin supplementation during the stocker phase and effects of feeding monensin during the finishing phase on performance and efficiency of beef steers.

      Materials and Methods

      Steers were fed hay or grazed cool-season annuals or bermudagrass in Arkansas before finishing in Canyon, Texas (blocks 1 and 2) or Stillwater, Oklahoma (block 3). Treatments were arranged as a 3 × 2 factorial with 3 monensin doses during the stocker phase (0, 882, or 1,764 g/t offered in a free-choice mineral) and 2 levels during finishing (0 or 37.5 mg/kg of diet DM). There were no block × treatment interactions (P ≥ 0.19) for performance or carcass measurements; therefore, data were pooled across blocks and finishing locations.

      Results and Discussion

      Stocker × finishing treatment interactions were not observed for finishing performance and efficiency data (P ≥ 0.50). There was no carryover effect on overall finishing performance or efficiency. Cattle consuming monensin during the finishing phase had decreased (P < 0.01) DMI during finishing and increased (P < 0.01) G:F and (P = 0.03) fat thickness compared with those not fed monensin during the finishing phase.

      Implications and Applications

      Supplementation of monensin to stocker cattle before finishing did not affect subsequent finishing efficiency response to monensin during finishing. Providing monensin in finishing diets still decreases DMI and improves feed efficiency of finishing cattle.

      Key words

      To read this article in full you will need to make a payment

      Purchase one-time access:

      Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online access
      One-time access price info
      • For academic or personal research use, select 'Academic and Personal'
      • For corporate R&D use, select 'Corporate R&D Professionals'


      Subscribe to
      Already a print subscriber? Claim online access
      Already an online subscriber? Sign in
      Institutional Access: Sign in to ScienceDirect


        • Boling J.A.
        • Bradley N.W.
        • Campbell L.D.
        Monensin levels for growing and finishing steers..
        J. Anim. Sci. 1977; 44: 867-871
        • Depenbusch B.E.
        • Drouillard J.S.
        • Loe E.R.
        • Higgins J.J.
        • Corrigan M.E.
        • Quinn M.J.
        Efficacy of monensin and tylosin in finishing diets based on steam flaked corn with and without corn wet distillers grains with solubles..
        J. Anim. Sci. 2008; 86: 2270-2276
        • Drouillard J.S.
        • Kuhl G.L.
        Effect of previous grazing nutrition and management on feedlot performance of cattle..
        J. Anim. Sci. 1999; 77: 136-146
        • Duffield T.F.
        • Merrill J.K.
        • Bagg R.N.
        Meta-analysis of the effects of monensin in beef cattle on feed efficiency, body weight gain, and dry matter intake..
        J. Anim. Sci. 2012; 90: 4583-4592
        • Felix T.L.
        • Loerch S.C.
        Effects of haylage and monensin supplementation on performance, carcass characteristics, and ruminal metabolism of feedlot cattle fed diets containing 60% dried distillers grains..
        J. Anim. Sci. 2011; 89: 2614-2623
        • Goodrich R.D.
        • Garrett J.E.
        • Gast D.R.
        • Kirick M.A.
        • Larson D.A.
        • Meiske J.C.
        Influence of monensin on the performance of cattle..
        J. Anim. Sci. 1984; 58: 1484-1498
        • Males J.R.
        • Hunt C.W.
        • Lee Jr., D.D.
        Monensin supplemented winter pasture for growing feeder calves..
        J. Anim. Sci. 1979; 48: 1295-1298
        • McCartor M.M.
        • Randel R.D.
        • Carroll L.H.
        Dietary alteration of ruminal fermentation on efficiency of growth and onset of puberty in Brangus heifers..
        J. Anim. Sci. 1979; 48: 488-494
        • Meyer N.F.
        • Erickson G.E.
        • Klopfenstein T.J.
        • Greenquist M.A.
        • Luebbe M.K.
        • Williams P.
        • Engstrom M.A.
        Effect of essential oils, tylosin, and monensin on finishing steer performance, carcass characteristics, liver abscesses, ruminal fermentation, and digestibility..
        J. Anim. Sci. 2009; 87: 2346-2354
      1. NASEM (National Academies of Sciences, Engineering and Medicine). 2016. Nutrient Requirements of Beef Cattle. 8th rev. ed. Natl. Acad. Press, Washington, DC. 10.17226/19014

      2. Novilla, M. N. 2011. Ionophores. Pages 373–384 in Reproductive and Developmental Toxicology. R. C. Gupta, ed. Acad. Press, Cambridge, MA. 10.1016/B978-0-12-382032-7.10029-3.

        • Oliver W.M.
        Effect of monensin on gains of steers grazed on coastal Bermudagrass..
        J. Anim. Sci. 1975; 41: 999-1001
        • Owens F.N.
        • Dubeski P.
        • Hanson C.F.
        Factors that alter the growth and development of ruminants..
        J. Anim. Sci. 1993; 71: 3138-3150
        • Perry T.W.
        • Beeson W.M.
        • Mohler M.T.
        Effect of monensin on beef cattle performance..
        J. Anim. Sci. 1976; 42: 761-765
        • Potter E.L.
        • Cooley C.O.
        • Richardson L.F.
        • Raun A.P.
        • Rathmacher R.P.
        Effect of monensin of performance of cattle fed forage..
        J. Anim. Sci. 1976; 43: 665-669
        • Raun A.P.
        • Cooley C.O.
        • Potter E.L.
        • Rathmacher R.P.
        • Richardson L.F.
        Monensin on feed efficiency of feedlot cattle..
        J. Anim. Sci. 1976; 43: 670-677
        • Reuter R.R.
        • Beck P.A.
        Southern Section Interdisciplinary Beef Cattle Symposium: Carryover effects of stocker cattle systems on feedlot performance and carcass characteristics..
        J. Anim. Sci. 2013; 91: 508-515
        • Schelling G.T.
        Monensin mode of action in the rumen..
        J. Anim. Sci. 1984; 58: 1518-1527
        • Stock R.A.
        • Laudert S.B.
        • Stroup W.W.
        • Larson E.M.
        • Parrott J.C.
        • Britton R.A.
        Effect of monensin and monensin and tylosin combination on feed intake and variation of feedlot steers..
        J. Anim. Sci. 1995; 73: 39-44
        • Weiss C.P.
        • Beck P.A.
        • Gadberry M.S.
        • Hess T.
        • Hubbell D.
        Effect of monensin dose from a self-fed mineral supplement on performance of growing steers on forage-based diets..
        Appl. Anim. Sci. 2020; 36: 512-523
        • Weiss C.P.
        • Beck P.A.
        • Richeson J.T.
        • Tomczack D.J.
        • Cai J.
        • Hess T.
        • Hubbell D.
        • Zhao J.
        Effect of monensin intake during a stocker phase and subsequent finishing phase on rumen bacterial diversity of beef steers..
        J. Anim. Sci. 2019; 97: 163-164

      Linked Article