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Outline of a New Technique for Digestion Trial Procedure

Virginia Agricultural Experiment Station

ABSTRACT

At the Virginia Agricultural Experiment Station, during the last 30 years, a great deal of feeding research has been conducted with dairy cows, to determine digestibility and nutrient balances. In conducting such trials the research man knows that only by constant vigilance can reliable data be obtained. Relaxed vigilance may result in errors which cannot be corrected and elimination of data during a period in which an error occurs is likely to introduce another error of similar or even greater magnitude. Therefore, in this type of work at this station it has been found necessary to maintain a twenty-four hour supervision by a trained chemist, of the whole procedure of collecting and sampling the excrements.

Further, considerable attention has been given to the possibility of loss of nitrogen from the solid and liquid excrements when these are kept for twenty-four hours before taking samples for chemical determinations. Warm weather, warm rooms, unsterilized containers, volatilization and chemical changes may cause losses which may be very significant in evaluating the results.