Rumensin Technical Manual, 1975. The increased efficiency of rumen fermentation realized by the feeding of ionophores allows the cattle to capture more energy from feedstuffs. Feedlot cattle consume feed until an internal chemostatic signal alerts the brain that the animals' energy requirements are satisfied. Less feed is required to elicit this signal when ionophores are fed, therefore, cattle fed ionophores tend to eat less feed but maintain the same rate of gain. Utilizing less feed to achieve the same gain results in more favorable feed efficiency.
Feed efficiency is a major determinant of feedlot profitability.
Feedlot finishing diets are high in grain and low in fiber. These conditions favor rumen acidity and the potential for feedlot bloat. Ionophores reduce the production of lactic acid in the rumen controlling acidity and reducing the incidence and severity of bloat. Rumensin and Bovatec both are effective in controlling coccidiosis when fed at appropriate levels. Rumensin is also approved for the prevention of coccidiosis.