Fungal Cellulase and Hemicellulase Prediction of Forage Digestibility

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Abstract
An enzymatic procedure using Trichoderma viride carbohydrases, a fungal hemicellulase, and pepsin was developed to provide a laboratory method for predicting forage digestibility. The amount of forage dry matter solubilized by enzymes and incubation buffer was less than that in vivo or by in vitro fermentation by rumen microorganisms. Total forage dry matter solubilized by the enzymatic procedure was correlated (.92) with in vitro digestibility. Simple correlation coefficients between in vivo true digestibility of 18 forages and total dry matter solubilized by enzymes and buffer was .87; that soluble in the buffer only, .65; and that solubilized by the enzymes, .82. Correlation coefficients with in vivo true digestible amount of cell-wall and protein were greater when the forage species were considered separately than when pooled together. With this restriction, the enzymatic procedure can be a useful method for predicting forage digestibility. Fermentations with rumen inoculum however, provided more accurate predictions of in vivo digestibility in a variety of forage species.

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