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A Critical Study of Energy Determination in Fresh and Dried Cow Feces¹

Dairy and Animal Science Department, Massachusetts Agricultural Experiment Station, Amherst

ABSTRACT

An accurate method of determining energy in fresh feces is described in detail. The energy content of eight samples of cow feces was determined in freeze-dried, oven-dried, and fresh feces. Moisture was determined by freeze drying, by the toluene distillation method, and by oven drying at 80° C. The three methods are compared and discussed.

The results of the duplicate energy determinations in the feces dried by two different methods, and the triplicate determinations in the fresh feces calculated on a comparable basis by means of the three different moisture determinations, are compared and evaluated and their errors discussed. The difference between the energy content of freeze-dried, oven-dried, and fresh feces calculated to a comparable basis by means of the most reliable water determination used in this study (freeze drying) was less than 2%.

¹ Contribution No. 1194 of the University of Massachusetts, Amherst.