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Factors Influencing in Vitro Rumen Cellulose Digestion

American Cyanamid Company, Pearl River, New York

Abstract

A study was made of factors influencing the digestion of cellulose by whole, unaltered rumen fluid.

The addition of n-valeric or isovaleric acids in concentrations of 5 to 250 mcg. per ml. had no effect on cellulose digestion.

Chlortetracycline, when fed to sheep at 20 mg. per day, had no appreciable effect on the ability of the rumen bacteria to digest the cellulose of alfalfa leaf meal.

Studies on varying the amount of alfalfa showed that only about one-half of the cellulose was available to the organisms, regardless of the amount of alfalfa meal present.

Of the three sources of cellulose studied, alfalfa meal was found to be most rapidly attacked; timothy was intermediate and Solka Floc was most resistant.