Susceptibility to stress, postmortem muscle metabolism and meat quality of pigs after modification of the fluid volume of the vascular and extravascular spaces.
Stress-resistant barrows were randomly assigned to groups of 15: I, control; II, hemorrhage 24 h before antemortem treatment; III, iv infusion of .45% NaCl 30 min before antemortem treatment; IV, iv infusion of 6% dextran (molecular weight 70,000) in saline 1 h before antemortem treatment and V, water deprivation for 48 h before antemortem treatment. Five barrows each within groups I through V were randomly assigned to three antemortem treatments: A, iv infusion 50% MgSO4 anesthesia; B, a forced walk of 100 m and electrical stunning (80 V for 20 s) and C, a forced walk, 5 min restraint with the use of a snare and electrical stunning. Postmortem muscle glycolysis was not affected by modification of fluid volumes before MgSO4 anesthesia or alteration of red-blood-cell mass in pigs exsanguinated under stress. However, an increase in fluid volume of the extravascular space accelerated postmortem glycolysis in pigs exsanguinated under stress. Thus, level of free water in muscle at exsanguination may control postmortem metabolism regardless of other antemortem extra- and intramuscular factors.
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Kolczak
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Kraeling
D000818:Animals; D004911:Erythrocyte Volume; D005110:Extracellular Space / Q000502:physiology*; D006470:Hemorrhage / Q000378:metabolism / Q000503:physiopathology / Q000662:veterinary; D008297:Male; D008460:Meat; D009132:Muscles / Q000378:metabolism*; D009919:Orchiectomy; D013312:Stress, Physiological / Q000097:blood / Q000378:metabolism / Q000503:physiopathology / Q000662:veterinary*; D013552:Swine / Q000502:physiology*; D013553:Swine Diseases / Q000097:blood / Q000378:metabolism / Q000503:physiopathology