Rumensin — adding more profit to the bottom line

Improves feed efficiency and prevents
and controls coccidiosis in feedlot cattle

Since 1976, cattle producers have relied on Rumensin to improve feed efficiency and prevent and control coccidiosis. And for 40 years, Rumensin has demonstrated proven results and continuous innovation, adding more profit potential to the bottom line.

Rumensin is a cost-effective feed additive that improves feed efficiency by providing more energy from the ration.1  Research demonstrates that Rumensin improves feed efficiency by 4 percent and provides a net return of $23.13/hd.2

For the prevention and control of coccidiosis, Rumensin is the most potent feed ingredient available3 that kills coccidiosis parasites at three different stages in the life cycle instead of merely slowing their development.4 It's more efficacious at lower doses compared to other ionophores.3

Coccidiosis declines in commercial feedyards
since Rumensin introduction

Rumensin was first cleared by the U.S. Food and Drug Administration for feedlot cattle in 1975 to improve feed efficiency. Throughout 1976, cattle feeders started adopting Rumensin in their commercial feedyards and found the prevalence of coccidiosis started to decline. At that time, coccidiosis was one of the most detrimental diseases, with estimated costs averaging $54.25/infected animal.5

From 1974 to 1982, the annual death loss from coccidiosis in Kansas and Nebraska feedlots dropped from 55–60 deaths/100,000 cattle to fewer than five deaths/100,000 cattle over the eight-year period—a 92 percent reduction.5 As seen in the table below, coccidiosis has declined in feedlots since the introduction of Rumensin.

Rumensin (feedyard) information

Label information

Important safety information

Consumption by unapproved species or feeding undiluted may be toxic or fatal. Do not feed to veal calves.

The label contains complete use information, including cautions and warnings. Always read, understand and follow the labels and use directions.

Dosage/Use levels

Rumensin: Cattle fed in confinement for slaughter

For improved feed efficiency: Feed 5 to 40 g/ton of monensin (90% DM basis) continuously in a complete feed to provide 50 to 480 mg/hd/d.

For the prevention and control of coccidiosis: Feed 10 to 40 g/ton of monensin (90% DM basis) continuously to provide 0.14 to 0.42 mg/lb of body weight/d of monensin up to a maximum of 480 mg/hd/d.

1. Richardson, L., Raun, A., Potter, E. et al. 1976. “Effect of monensin on rumen fermentation in vitro and in vivo.” J. Anim. Sci. 43: 657–664.

2. Elanco Study No. CR-0509. Data on file, 2007.

3. Long, P. and Jeffers, T. 1982. “Studies on the stage of action of ionophorous antibiotics against eimeria.” J. Parasitology. 68(3): 363–371.

4. McDougald, L. 1980. “Chemotherapy of coccidiosis.” The Biology of the Coccidia, P. Long (ed.): 373–427.

5. Edwards, A. 1984. “A new look at digestive diseases in feedlot cattle.” Animal Nutrition and Health. Jan-Feb: 28–30.


For Safety Data Sheet (SDS) contact 888-545-5973