Ammonia-Mineral-Suspension Treated Corn Silage, Protein Levels and Monensin for Growing and Finishing Beef Cattle

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Abstract
Three experiments were conducted with finishing beef cattle to study monensin, ammonia-mineral-suspension (AMS) corn silage and protein level effects. In the two monensin experiments, there was a feed efficiency improvement due to monensin (Experiment II, 11.2%; Experiment III, 13.2%). Cattle fed AMS corn silage gained faster (P<.01) than cattle fed regular silage as the result of more rapid early adjustment in one experiment. Comparative protein levels of from 515 to 722 g per day for growing heifers resulted in nonsignificantly different gains of .76 to .83 kg per day. At the lowest protein level (478 g total protein per day), the feeding of 150 mg monensin per heifer daily resulted in increased (P<.01) blood plasma urea nitrogen and also rumen fluid ammonia, suggesting a role for monensin of protein sparing on protein borderline to deficient diets. Increased levels of supplemental protein resulted in increased (P<.01) blood plasma urea N, but there was no monensin effect on such levels at optimum or high protein (555 or 650 g per day). Copyright © 1979. American Society of Animal Science . Copyright 1979 by American Society of Animal Science.

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