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- [1] ENZYME-ACTIVITIES AND CONCENTRATION OF METABOLITES IN BLOOD-SERUM AS INDICATORS OF PERFORMANCE IN DAIRY-COWS .3. FACTOR-ANALYSIS OF SERUM LEVELS AND THE RELATIONSHIP BETWEEN THE FACTORS AND MILK-YIELD ZEITSCHRIFT FUR TIERZUCHTUNG UND ZUCHTUNGSBIOLOGIE-JOURNAL OF ANIMAL BREEDING AND GENETICS, 1979, 95 (3-4): : 240 - 245