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METABOLISM AND HISTOCHEMISTRY OF SKELETAL MUSCLE FROM STRESS‐SUSCEPTIBLE PIGS
Author(s) -
SAIR R. A.,
KASTENSCHMIDT L. L.,
CASSENS R. G.,
BRISKEY E. J.
Publication year - 1972
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1972.tb02719.x
Subject(s) - lactic acid , skeletal muscle , metabolism , biology , anaerobic exercise , glycogen phosphorylase , medicine , muscle tissue , biochemistry , endocrinology , chemistry , enzyme , bacteria , physiology , genetics
The metabolism and histochemical characteristics of muscle from stress‐susceptible and stress‐resistant animals were studied. ATP values were. higher and lactic acid values lower in muscle of stress‐resistant animals than stress‐susceptible animals at the time of exsanguination. Results from oxygen uptake studies revealed that muscle from stress‐susceptible animals had a lower ability for aerobic metabolism or alternatively was more labile to damage during the isolation procedure. Our oxygen uptake values for pig muscle were lower than those reported for muscle from other species. The muscle from stress‐susceptible animals, when incubated under anoxic conditions, produced more lactic acid than did muscle from stress‐resistant pigs under conditions where the muscle from both types of animals had similar CP and ATP levels. Samples for histochemical analysis were examined from restrained and unrestrained muscle strips. There was a trend for the restrained samples to have somewhat smaller fibers. The muscle fiber size from Poland China animals was greater than that from Chester White animals. A large number of intermediate‐type fibers, on the basis of DPNH‐TR and phosphorylase staining, were found in the muscle of stress‐susceptible animals.