Abstract
One hundred sixty-four crossbred beef steers were used to determine optimal Rumensin ® concentrations in limit-fed, high-energy, growing diets. Diets contained 30, 40, or 50 grams of Rumensin per ton of dry matter (R30, R40, and R50). Average daily gain and feed efficiency during the growing phase were not different (P>.80) among treatments. Steers that received R50 in the growing phase had the highest average daily gains during the finishing phase (P<.05). This resulted in heavier carcass weights for R50 than R30 (P<.05) and R40 (P<.12). Feed efficiencies during the finishing phase were not different among treatments (P>.40).
Highlights
Food and Drug Administration regulations limit Rumensin to not more than 30 grams per ton of diet
This study was to determine if levels of Rumensin higher than those currently approved by the FDA, when added to limit-fed, high-energy, growing diets, would increase average daily gain and feed efficiency of cattle during the growing phase and subsequent finishing period
One hundred sixty-four crossbred beef steers weighing 574 lb were used in a randomized complete block design experiment
Summary
Food and Drug Administration regulations limit Rumensin to not more than 30 grams per ton of diet. Montgomery, J.J. Sindt, T.B. Farran, H.J. LaBrune, R.D. Hunter, James J. INCREASING LEVELS OF RUMENSIN® IN LIMIT-FED, HIGH ENERGY, GROWING DIETS FOR BEEF STEERS AND EFFECTS ON SUBSEQUENT FINISHING PERFORMANCE One hundred sixty-four crossbred beef steers were used to determine optimal Rumensin® concentrations in limit-fed, high-energy, growing diets.
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