Trusted By Every Generation¹

Growing beef steers and heifers 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/day.
For the prevention and control of coccidiosis due to Eimeria bovis and Eimeria zuernii: Feed 10 to 40 g/ton of monensin (90% DM basis) continuously to provide 0.14 to 0.42 mg/lb of body weight/day, depending upon severity of challenge, up to a maximum of 480 mg/hd/day.

Growing beef steers and heifers on pasture (stocker, feeder, and slaughter) or in a dry lot, and replacement beef heifers:
For increased rate of weight gain: Feed 50 to 200 mg/hd/day in at least 1.0 lb of Type C Medicated Feed. Or, after the 5th day, feed 400 mg/hd/day every other day in 2.0 lbs of Type C Medicated Feed. The Type C Medicated Feed must contain 15 to 400 g/ton of monensin (90% DM basis). Do not self feed.
For the prevention and control of coccidiosis due to Eimeria bovis and Eimeria zuernii: Feed at a rate to provide 0.14 to 0.42 mg/lb of body weight/day, depending upon severity of challenge, up to a maximum of 200 mg/hd/day. The Type C Medicated Feed must contain 15 to 400 g/ton of monensin (90% DM basis).
Type C free-choice medicated feeds: All Type C free-choice medicated feeds containing Rumensin must be manufactured according to an FDA-approved formula/specification.

Beef cows:
For improved feed efficiency when receiving supplemental feed: Feed continuously at a rate of 50 to 200 mg/hd/day. Cows on pasture or in dry lot must receive a minimum of 1.0 lb of Type C Medicated Feed per head per day. Do not self feed.
For the prevention and control of coccidiosis due to Eimeria bovis and Eimeria zuernii: Feed at a rate of 0.14 to 0.42 mg/lb of body weight/day, depending upon severity of challenge, up to a maximum of 200 mg/hd/day.

Calves (excluding veal calves): 
For the prevention and control of coccidiosis due to Eimeria bovis and Eimeria zuernii: Feed at a rate of 0.14 to 1.00 mg/lb of body weight/day, depending upon severity of challenge, up to a maximum of 200 mg of monensin/hd/day. The monensin concentration in Type C medicated feed must be between 10 and 200 g/ton.

1. Elanco Animal Health. Data on File. REF-30144.

2. Rumensin Freedom of Information Summary (NADA 95-735).

3. McDougald LR, Hofacre C, Mathis G, et al. Chemotherapy of coccidiosis. In: Long PL, editor. The Biology of the Coccidia. Baltimore, MD: University Park Press;1980:373-427.

4. Gadberry S, Beck P, Moore M, et. al. Meta-analysis of the effects of monensin on performance of beef replacement heifers and beef cows. Translational Anim Sci. 2022;6(3). https://academic.oup.com/tas/article/6/3/txac086/6613320.

5. Cushman RA, Kill LK, Funston RN, Mousel EM, Perry GA. Heifer calving date positively influences calf weaning weights through six parturitions. Journal of
animal science. 2013 Sep 1;91(9):4486-91.

6. Potter, E., Wray, M. et al. 1986. Effect of monensin on the performance of cattle on pasture or fed harvested forages in confinement. J. Anim. Sci. .62:583-92.

7. Duffield TF et al Meta-analysis of the effects of monensin in beef cattle on feed efficiency, body weight gain, and dry matter intake. Journal of Animal Science 2012 4583.