Rumensin™ (Monensin as monensin sodium)

Get more energy from every mouthful!
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Rumensin™ (Monensin as monensin sodium)
Rumensin™ (Monensin as monensin sodium)

Get more energy from every mouthful!

Rumensin™ is an essential ingredient in supplementary feeds and is the only FDA-approved feed ingredient for lactating and dry cows that increases milk production under many conditions. Rumensin™ enables cows to get more energy from every mouthful by altering the composition of the microbial population in the rumen, thereby improving feed conversion efficiency and milk production. In addition, Rumensin™ aids in reducing the severity of non-clinical ketosis as well as the prevention and control of coccidiosis. Reducing the challenge of this disease in dairy calves and heifers can lead to an increased rate of weight gain.

Rumensin™ is scientifically proven to improve feed efficiency, reproductive performance and aids in the control of bloat and prevention of coccidiosis.

Important Safety Information

Before using this product, please refer to the label for complete instructions. 

Withholding Periods


Export Slaughter Interval

CATTLE: An ESI has not been established.

Directions For Use


DO NOT USE in chickens producing eggs
DO NOT USE in sheep or goats which are producing or may in the future produce milk where the milk or milk products may be used for human consumption


Dogs, horses and other equines must not be allowed access to feeds containing Rumensin™. Ingestion of Rumensin™ may be fatal in these species.


The recommended levels of Rumensin™ must not be exceeded. Excessively high levels due to mixing errors can cause reduced feed intake, poor growth, diarrhoea, and death. Poultry consuming monensin sodium should not be treated with tiamulin. Severe growth depression or death may occur.

Responses to Rumensin™ are unlikely if nutrient intake is significantly restricted. Responses to Rumensin™ in pasture cattle may not occur if pasture quality is poor or if weather conditions are very hot and dry.

Sheep consuming Rumensin™ should not be fed more than the maximum recommended level, as levels about 20ppm have been shown to produce a decline in Average Daily Growth.

Mixing Directions

IMPORTANT: Rumensin™ should be thoroughly mixed with the other feed components and care should be taken in transporting mixed feed to prevent settling.

Complete Feed 1 Supplements  
  monensin ppm in feed2 Rumensin™ 100 kg/tonne of feed monensin mg/head/day Rumensin™ 100 grams/head/day
DAIRY COWS 3        
Milk Production, Ketosis 6 - 18 0.06 - 0.18 200 - 450 2.0 - 4.5
Coccidiosis 11 - 18 0.11 - 0.18    
Bloat 11 - 18 0.11 - 0.18 200 - 450 2.0 - 4.5
Weight gain, reproductive performance (heifers) 11 - 33 0.11 - 0.33 200 - 360 2.0 - 3.6
CALVES (50-250kg) monensin ppm in feed Rumensin™ 100 kg/tonne of feed monensin mg/kg BW/Day4 Rumensin™ 100 mg/kg BW/day
Coccidiosis 11 - 33 0.11 - 0.33 0.5 - 1.0 5.0 - 10.0

1 Calculated on a 90% dry matter basis. Rations containing silage or other wet feeds should be corrected to a 90% dry matter basis for calculations of the appropriate monensin dosage.

2 ppm = parts per million which is equivalent to mg/kg

3 Feeding monensin to lactating dairy cows may result in decreased milk fat percentage, but there is no effect on total fat yield

4 kg BW = kilograms bodyweight