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Journal of Dairy Science Vol. 65 No. 5 732-739
© 1982 by American Dairy Science Association ®
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Neutralization of Acid in the Rumen by Magnesium Oxide and Magnesium Carbonate1

D. M. Schaefer, L. J. Wheeler, C. H. Noller, R. B. Keyser and J. L. White2

Department of Animal Science and Agronomy, Purdue University, West Lafayette, IN 47907

ABSTRACT

Two reagent and two feed grade magnesium oxides and reagent grade magnesium carbonate, sodium bicarbonate, and calcium carbonate were evaluated to ascertain their ability to neutralize acid in the rumen. Rumen fluid pH was increased in vitro, compared to the control, by antacid compounds, and their increases ranked: calcium carbonate < feed grade magnesium oxide A < light magnesium oxide and feed grade magnesium oxide B < heavy magnesium oxide < magnesium carbonate < sodium bicarbonate. Titrations at constant pH's ranging from 3.0 to 7.5 indicated that these magnesium compounds were reactive at pH's normally in the rumen although reactivity decreased with increasing pH.

Intraruminal doses of feed grade magnesium oxide A and calcium carbonate did not change rumen fluid pH as compared to the control treatment; however, increases in rumen fluid pH for other compounds ranked: feed grade magnesium oxide B < magnesium carbonate < heavy magnesium oxide. Feeding of heavy magnesium oxide or magnesium carbonate increased rumen fluid pH as compared to the control diet. Feeding feed grade magnesium oxide B in three quantities to cattle resulted in proportional increases in fecal pH and fluidity of feces. Two feed grade magnesium oxides differed in their ability to neutralize acid in the rumen.

FOOTNOTES

1 Journal Paper No. 8613, Purdue University Agricultural Experiment Station

2 Department of Agronomy.






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Copyright © 1982 by the American Dairy Science Association ®.