A Legacy of Progress

Rumensin® has been helping cattle producers build their legacy for over 40 years. We pride ourselves on continuous innovation and research.Learn more about our legacy below.

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1967

  • Active ingredient monensin is first discovered
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1975

  • Rumensin® is approved by the FDA for feedlot cattle to improve feed efficiency
  • Rumensin 30 is introduced to help cattle producers improve feed efficiency
  • Elanco’s Feed Assay Service is first offered to producers, helping them to ensure proper levels of Rumensin are included in rations
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1979

  • Rumensin 60 is introduced with an improved granulated formula
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1983

  • Rumensin is approved for dairy and beef replacement heifers
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1988

  • Rumensin is approved for use in pasture animals and mature beef cows
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1990

  • Rumensin is approved for the prevention and control of coccidiosis in confined cattle and calves
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2004

  • Rumensin is approved for lactating and dry dairy cows to improve milk production efficiency*
  • Rumensin is approved in combination with Optaflexx®, Tylan® and Melengestrol Acetate (MGA)
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2016

  • Elanco Feed Mixing Study Service and Mixing Demonstrations are introduced to assist producers with proper feed mixing and ration uniformity
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MADE IN AMERICA

Elanco quality means consistent products, complete traceability, and absolute credibility and quality. Learn more about Clinton Manufacturing, our West Central Indiana site, and how Rumensin is made.

*Production of marketable solids-corrected milk per unit of feed intake.
Feeding Directions
Dairy cows: For increased milk production efficiency (production of marketable solids-corrected milk per unit of feed intake):
Total Mixed Rations (“complete feed”): Feed continuously to dry and lactating dairy cows a total mixed ration (“complete feed”) containing 11 to 22 g/ton monensin on a 100% DM basis.
Component Feeding Systems (including top dress): Feed continuously to dry and lactating cows a Type C medicated feed containing 11 to 400 g/ton monensin. The Type C medicated feed must be fed in a minimum of 1.0 lb of feed/cow/day to provide 185 to 660 mg/hd/day monensin to lactating cows or 115 to 410 mg/hd/day monensin to dry cows. This provides cows with similar amounts of monensin they would receive by consuming total mixed rations containing 11 to 22 g/ton monensin on a 100% DM basis.