. Cyclopedia of farm animals. Domestic animals; Animal products. Fig. 75. Sketch of the Zuntz tread-power dynamometer. (Adapted from Landw. Jahrb., Vol. xviii, Plate I.) would appear that the food is of value for the pro- duction of work in proportion to its net available energy, or maintenance value. On a preceding page there has been given a table showing the results secured by Zuntz and Hagemann, for the available energy of certain feeding-stuffs for the horse. Assuming these figures to be correct, they show, for example, that one pound of meadow hay will supply sufficient energy to the bod
. Cyclopedia of farm animals. Domestic animals; Animal products. Fig. 75. Sketch of the Zuntz tread-power dynamometer. (Adapted from Landw. Jahrb., Vol. xviii, Plate I.) would appear that the food is of value for the pro- duction of work in proportion to its net available energy, or maintenance value. On a preceding page there has been given a table showing the results secured by Zuntz and Hagemann, for the available energy of certain feeding-stuffs for the horse. Assuming these figures to be correct, they show, for example, that one pound of meadow hay will supply sufficient energy to the body of the horse to make good an expenditure by the muscles of 327 Cals. of energy for the performance of muscular work, while one pound of oats would make good a loss of 882 Cals. Unfortunately, however, the data on which this table is con- stucted involve a number of assumptions and the results are of somewhat questionable value. Utilization of available energy.—Very extensive and careful experiments have been made to deter- mine how much of the energy liberated in the body by the breaking down and oxidation of tissue during muscular work is actually recovered in the form of work. The general method of these experi- ments has been to determine the increased amount speed increases. When the gait is changed to a trot there is a marked increase in the energy expended in traveling the same distance, but the requirement remained unaffected by the speed up to a rate of about miles per hour, beyond which no experiments were made. It may be safely assumed, however, that at high speeds the expendi- ture of energy is much greater. There is no way of directly measuring the actual amount of mechanical work performed in simple locomotion, so as to compare it with the amount of energy liberated in the body. The best available computations of it, however, indicate a percentage utilization of the energy in this form of work of about 35 per cent, or rather- greater than that observed in m
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