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Nitrogen excretion rate and oxtgen consumption

Is oxygen consumption the ideal indicator for the metabolic rate in all animals under all circumstances? why or why not?

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Oxygen consumption is a good estimator of metabolic rate, but it is not ideal for every situation. The oxygen consumption method is based in the fact that the rate of heat production is strongly correlated to the rate of substrate metabolism, which can be estimated by measuring oxygen consumption. This is a fairly reliable technique although metabolic rate could vary a ...