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The Desiccation and Analysis of Feces in Digestion Experiments with Steers

Oklahoma Agricultural Experiment Station

Abstract

The problem of inaccuracies in apparent digestibility coefficients was approached from the standpoint of simple errors associated with the usual analysis of feeds and feces in digestion trials.

Errors of 10 percent in moisture, from 4 to 11 percent in nitrogen, and from 20 to 25 percent in ether-extract were readily demonstrated in the determination of these constitutents in feces by unreliable procedures.

The errors of fecal analysis were shown to effect large errors in digestion coefficients of constituents that are poorly digested and small errors in the coefficients of those that are quite completely digested. Precautions were recommended to prevent these errors.

A procedure was suggested for the analysis of fresh feces which gave results in good agreement with those obtained on ground air-dry samples. This procedure, which may prove to have practical value, merits further study under other experimental conditions.

¹ Present address of C. S. Hobbs is Department of Animal Husbandry, Cornell University.