An object of the present invention is to provide a method for rapidly evaluating the risk of spontaneous oxidative odor development in raw milk to obtain a milk product such as milk with reduced off-flavor and good quality. The object is to provide a method for producing hexanal in raw milk by subjecting the raw milk to an oxidation treatment in the presence of an oxidation catalyst at a temperature below 10 degrees Centigrade for a time of at least 30 minutes, A method for treating breast milk, comprising the steps of: Stopping the development of hexal in raw milk by subjecting the raw milk to an oxidation stop treatment; measuring the concentration of hexal in the raw milk; and determining the risk of developing spontaneous oxidative odor in the raw milk based on the measured concentration of hexal in the raw milk, A method for evaluating the risk of...

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