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A Study of the Variability of the Computed and the Directly Determined Fasting Katabolism as a Measure of the Maintenance Requirement of Energy

Institute of Animal Nutrition, Pennsylvania State College

Abstract

The maintenance requirement of an animal is of significance as an expense which must be met before there can be a profit from feeding, and as the most definite fixed value in terms of which to reckon a rate of feed supply. It is also of special significance in the work of this Institute, since the main program of research is the determination of net-energy values of feeds and net-energy requirements of animals. Both of these measurements necessitate the determination of the energy of maintenance separate from that utilized for gain.

Heat Production of Fast Is Standard Measure

The standard measure of maintenance requirement of energy, for all species of animals, is heat production during fast—a point of view unequivocally accepted and at all times followed by Armsby. Thus, Armsby's standard for the maintenance requirement of energy for swine is based entirely on direct measurements of the fasting katabolism.

In the case of ruminants, the question has been not as to the standard but as to the method of measurement—as to whether the fasting katabolism is to be determined directly, as the heat production of a fasting animal, or, in view of the alleged impracticability of the direct determination, whether it is to be computed from differences in heat production and differences in feed between periods differing as to feed intake.