Archive image from page 117 of Cyclopedia of farm animals (1922). Cyclopedia of farm animals cyclopediaoffar00bail Year: 1922 PRINCIPLES OF STOCK-FEEDING pounds of useful work, we find that the amount of energy which he expends, in addition to that re- quired for moving his own body horizontally, will be about three Calories; in other words, about one-third of the energy liberated is recovered in the work done. The proportion utilized varies, however, with different kinds of work, as the fol- lowing table shows: Percentage Utilization op Net Available Energy by the Horse Walking— Per cent As
Archive image from page 117 of Cyclopedia of farm animals (1922). Cyclopedia of farm animals cyclopediaoffar00bail Year: 1922 PRINCIPLES OF STOCK-FEEDING pounds of useful work, we find that the amount of energy which he expends, in addition to that re- quired for moving his own body horizontally, will be about three Calories; in other words, about one-third of the energy liberated is recovered in the work done. The proportion utilized varies, however, with different kinds of work, as the fol- lowing table shows: Percentage Utilization op Net Available Energy by the Horse Walking— Per cent Ascending 11 per cent grade Ascending 18 per cent grade Ascending 16 per cent grade with load on back . Draft per cent grade Draft per cent grade Trotting— Ascending 11 per cent grade Draft per cent grade It is seen that, in general, about one-third of the energy actually liberated in the body is recovered in the form of work, the remaining two- thirds taking the form of heat and causing the familiar increase in heat production dur- ing work. It will be observed, however, that the percentage of the energy recovered varies more or less, it being affected by the kind of work, by the speed of the animal, by the <5i gait (whether trotting or walking), and other factors. The individuality of the ani- mal also plays a part, horses of one type showing a greater efficiency as riding horses and others a greater efficiency as draft horses. The foregoing results are often cited to show the high efficiency of the animal as a prime motor in comparison with artificial motors. Such a comparison, however, is to a certain degree misleading. It fails to take account of the fact that to perform work the animal must expend a considerable u~?ixtt of energy in moving his own body, and that a further expenditure of energy is required for his maintenance even when doing no work. Moreover, it ignores the expenditure of energy required to digest the f
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