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Effect of Fluoride, Magnesium and Manganese Ions on in Vitro Cellulose Digestion by Rumen Microorganisms^{1, 2,}

University of Tennessee, Knoxville, and Iowa State University, Ames

Abstract

A washed suspension, artificial rumen technique was utilized in a series of studies to determine the effect of fluoride concentration on cellulose digestion, and the possibility of an interaction of fluoride, magnesium and manganese. Fluoride inhibition of cellulose digestion was demonstrated. However, when cellulose digestion was plotted against fluoride concentration it did not result in a linear relationship. Mixed rumen cultures apparently can use the magnesium and/or the manganese ion in cellulose degradation. The omission of magnesium did not result in significant lowering of the cellulose digestion while the omission of manganese did result in a significant reduction. When both magnesium and manganese were omitted there was a highly significant reduction in cellulose digested that was not further affected by the addition of fluoride.

¹ A condensation of a portion of a thesis presented to the graduate council of Iowa State University by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy, August, 1959.

² Published with the approval of the Director of the Tennessee Agricultural Experiment Station and as Journal Paper No. J-4332 of the Iowa Agricultural and Home Economics Experiment Station, Project No. 1208.