Plasma creatine phosphokinase (PCPK) activity was determined in 14 clinically normal adult pedigree dogs of various breeds with an activated enzyme assay medium. PCPK levels were not significantly influenced by the time of sampling, body mass or eating, but there was a significant correlation (P is less than 0.05) between PCPK levels and moderate physical activity. The mean enzyme activity was 22.9 iu/litre at 30 degrees C. The PCPK levels are 10 times greater than those obtained by other authors with the non-activated enzyme assay method.
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