34 Landrace,38 Duroc and Lange white pigs were taken at random to examine the blood biochemical constants. The results showed that K+,Na+,Pi contents and alkaline phaphatase activites of three breeds were all below the normal range while their Cl- contents and total amylase activities were higher than the normal range. The other constants tested were within the normal range. Variance analysis showed that total tallow contents and activities of lactic dehydrogenase,γglutamy transpeptidase and amylase were significantly different amo...