FDSC 319 Lecture Notes - Lecture 10: Autopsy, Exsanguination, Skeletal Muscle
22 Apr 2019
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Need to stun (lessen suffering) use electric/concussion/co2. *not in kosher/halal meat (throat slit -> lose blood from carotid artery) In post mortem animal: blood flow to organs ceases (anabolic/catabolic process no longer in equilibrium; more catabolism) -> oxymb depleted, atp levels fall, creatine p falls, etc. Cold-shortening: flesh cut from skeletal structure -> chill before rigor. At low temp (before rigor): mgatpase capacity to pump cu for sarcoplasm into sr is slowed. Ca build up in sarcoplasm -> displace troponin/tropomyosin complex from actin -> allow actomyosin to form -> shortened muscle structure. No skeletal muscle to hold muscle -> more contraction/shortening. Tough, shorter meat; will need longer resolution phase. Muscle is frozen rapidly before rigor -> form intracellular ice crystals. Disrupt sr membrane -> ca floods sarcoplasm, etc. Effect: shorter/tougher (rapid freezing: less ice damage) Oil seeds high oil content; 50% global edible oil production. Every ton of oil -> 4. 5 tonnes meal byproduct (45% protein)
