[Technical study of hydroxybutyrate and acetoacetate levels in blood and milk of cattle].

A method for sampling, for preservation of these samples and for dosage has been studied in order to gain a better knowledge of the usual values and the physiological and pathological variations of beta-hydroxybutyrate and of acetoacetate in the blood and milk of cattle. These methods permit the practical realization of sampling. They also make possible the transportation of these samples, though on the condition that they are immediately frozen or put into refrigeration. The study of the dosage parameters and of their effect has led to a standardization which makes it possible to obtain both a satisfactory yield and satisfactory accuracy.