Muscle G-6-P and Serum CPK as Related to Pork Quality

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Abstract
A survey of 118 crossbred market hogs on six commercial farms in Illinois and Indiana indicated a wide variation in antemortem muscle glucose-6-phosphate (G-6-P) between animals. In some cases muscle biopsy G-6-P was highly correlated with color and firmness score of the muscle postmortem. In a controlled experiment three groups of 20 crossbred market hogs were placed in confinement barns at the University of Illinois. Three longissimus biopsies were removed from each animal at 2-week intervals. On alternate weeks, blood samples were collected via vena cava puncture, or a slit in the ear vein. Two to 4 weeks post-biopsy the animals were slaughtered; postmortem metabolism, meat quality, and carcass characteristics were determined. Significant correlations between samples evaluated for G-6-P within an animal were established; however, this was not true for serum creatine phosphokinase (CPK) levels. The majority of biopsy G-6-P levels were negatively correlated with 30 min. postmortem adenosine triphosphate (ATP) and phosphocreatine (PC) in the longissimus (P < .05). However, no significant correlations between postmortem parameters and serum CPK were found. There were no consistent relationships between any antemortem measurements, color, firmness of the longissimus, or carcass characteristics. Color was positively correlated with 30-min. postmortem levels of G-6-P, ATP, PC and negatively correlated with 30- and 60-min. postmortem lactic acid. Copyright © 1974. American Society of Animal Science . Copyright 1974 by American Society of Animal Science.

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