Growth and development with special reference to domestic animals XXXIV: Basal metabolism, endogenous nitrogen, creatinine and neutral sulphur excretions as a function of body weight
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An analysis of a very large body of basal (energy) metabolism data of mature animals of different species ranging in weight from 0.02 to 4000 kg (mice to elephants) shows that basal metabolism tends to vary with the 0.73 power of body weight. The general equation is Q=70.5 M0.734 in which Q is heat production (basal metabolism in kilo-calories per day) for body weight, M, in kilograms. An analysis of a smaller, but respectable, body of data on minimum (endogenous) urinary nitrogen excretion by mature animals ranging in weight from 0.02 to 500 kilograms (mice to cattle ) shows that the endogenous urinary nitrogen excretion tends to vary with the 0.72 power of body weight. The general equation is N=I46 MO.72 in which N is mgs per day of endogenous urinary nitrogen excretion for bcdy weight, M, in kilograms.