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Highlight Regression equations for six methods of expressing the relationship between digestible energy and digestible dry or organic matter were developed from digestion trials conducted with cattle grazing native range forage. Concentrate feeds supplemented the grazing animal's diet in some trials. The results of this study indicated that the laborious determination of digestible energy could be replaced by

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Perloline, an alkaloid isolated from Festuca arundinacea, inhibited in vitro cellulose digestion by microorganisms of rumen fluid. Digestion of purified cellulose was more sensitive to perloline than was the digestion of cellulose in leaf tissue of F. arundinacea. Poor performance of cattle grazing F. arundinacea may be related to the effect of perloline on the digestion of cellulose by rumen microorganisms.