. Bulletin. Agriculture -- New Hampshire. 16 University of New Hampshire [Sta. Bull. 331 or absorbing- food the collective activity of the cells represents basal metabolism which is minimum tempo at which this biological engine can function without stalling. The basal metabolism is therefore merely the persistent minimum effort necessary to keep alive. Bio- logically the energy expended in basal metabolism, or idling of the animal motor, can be regarded as the maintenance requirement. As a functional expression it also represents the internal adaptation of organs, glands, for the potenti
. Bulletin. Agriculture -- New Hampshire. 16 University of New Hampshire [Sta. Bull. 331 or absorbing- food the collective activity of the cells represents basal metabolism which is minimum tempo at which this biological engine can function without stalling. The basal metabolism is therefore merely the persistent minimum effort necessary to keep alive. Bio- logically the energy expended in basal metabolism, or idling of the animal motor, can be regarded as the maintenance requirement. As a functional expression it also represents the internal adaptation of organs, glands, for the potential conversion of energy, that is. the comparative ""horsepower" rating of this biological motor. This is illustrated in Fig. 6 by the contrast in internal adaptation to function as represented by the size of thoracic cavity or container of heart and lungs ( power plant) in relation to external circum- ference and thickness of eii^ FIGURE n. EVEX SLOW PLODDING WORK INCREASES ENERGY EXPENDITURE TEN FOLD OVER RESTING Basal metabolism or energy expenditure thus has physiological importance to the individual, but in domestic animals it contributes nothing to our own welfare. Economically its value is nil. From the economic point of view animal life really begins here with its innu- merable activities. Categorically we let in the clutch on the idling- motor, fuel (i. e. food) consumption goes up and the animal begins to carry out those economically important ftmctions to which its in- ternal adaptation is designed. By selective breeding we have developed animals of many types, and with highly specialized functions far beyond those possessed by their feral ancestors. In every class of farm livestock, even including poultry, we have thus created breeds with contrasting adaptations in regard to the use which they make of food energy. In the adaptation of these specialized functions for utilizing food energy they may be regarded as representing three general cl
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