By increasing milk production efficiency,* Rumensin®
(Monensin, USP) adds value throughout lactation

Rumensin® Microtracer®

The feed companies that supply quality feed products to the cattle industry have utilized Elanco Rumensin as an integral component of their feeding programs.  To assist feed manufacturers in providing a quality feed product to their customers, Elanco has added Microtracers to Rumensin.  Microtracers can provide a quick method for confirmation of inclusion or absence of Rumensin in the feed.  

Microtracers are extremely small, stainless steel particles with a unique color coating, which do not impact the feed, animal, or environment when Rumensin is used.  With the addition of Microtracers in Rumensin, samples of premix or supplements can be tested for the presence of Rumensin in less than 3 minutes. 

Elanco provides two Rumensin Microtracer detection kits, Mason Jar and Rotary detector.  


* production of marketable solids-corrected milk per unit of feed intake

Rumensin is approved for use in dairy cows in more than 20 countries around the world. Extensive research associated with these approvals shows that the natural wholesomeness and quality of milk from Rumensin-fed cows are maintained throughout lactation. In addition, the FDA has determined that both milk and meat from cows fed Rumensin are safe for human consumption. That’s why no withdrawal is required when feeding Rumensin to dairy cows, heifers or calves.

Important safety information

The label contains complete use information, including cautions and warnings. Always read, understand and follow the label and use directions. Consumption by unapproved species or feeding undiluted may be toxic or fatal. Do not feed to veal calves.

Dosage/Use Levels

Dairy cows

For increased milk production efficiency (production of marketable solids-corrected milk per unit of feed intake).

Feeding Directions

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% dry matter 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 pound of feed per cow per day to provide 185 to 660 mg/head/day monensin to lactating cows or 115 to 410 mg/head/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% dry matter basis.