The Relation of Cellulose and Lignin Content to the Nutritive Value of Animal Feeds

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Abstract
Data are presented which show the limitations, as measures of digestibility and nutritive value, of the crude fiber and nitrogen-free extract partition of the carbohydrates in animal feeds. Based on studies of various procedures, methods are proposed for the determination of cellulose and lignin in feeds and feces. The usefulness of the inclusion of these determinations in feed analyses is shown by data obtained in digestion trials with rabbits and steers. The data indicate that, at least for Herbivora, a partition of the carbohydrate portion of a feed into lignin, cellulose and other carbohydrates may have more biological significance, and hence be of greater usefulness in predicting feeding values than the present division into crude fiber and nitrogen-free extract.

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