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pork notes fall 2010

pork notes fall 2010 - PSS Porcine Stress Syndrome...

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PSS – Porcine Stress Syndrome Recognized in late 1960’s Lean, heavy muscled pigs died suddenly Stress induced muscle contraction Mixing with other pigs Temperature change Moving Symptoms: muscle rigidity, labored breathing, increased body temp
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PSS – Porcine Stress Syndrome
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Channel Proteins ions ions aqueous pore
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PSS Gene Carriers
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Halothane produces the physiological response of muscle contraction – typical of a PSS pig “Halothane Gene”
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PSS and Pork Quality Pigs exhibiting PSS condition have greater incidence of PSE condition in meat What is PSE? P ale S oft E xudative
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PSE Pale, Soft, and Exudative (PSE)
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Relation of pH to PSE Muscle pH related to energy breakdown in the muscle Glycogen breakdown produces lactic acid Under anaerobic conditions
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www-rohan.sdsu.edu/.../ section1/Glycolysis.htm
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Relation of pH to PSE Muscle pH related to energy breakdown in the muscle Glycogen breakdown produces lactic acid Lactic acid reduces pH Acidic conditions reduce ability of muscle fibers to hold moisture
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Other Causes of PSE High stress handling prior to slaughter Harvest immediately following transport Slaughtering without feed withdrawal Carcass not getting chilled quickly
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Methods to Reduce PSE Good management is key Use low stress handling Remove feed 24 hr prior to slaughter Do not slaughter immediately after hauling to plant Rapid freeze after slaughter
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RFN Ham Red, Firm, and Normal (RFN)
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PSE Pale, Soft, and Exudative (PSE)
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DFD Ham Dark, Firm, and Dry (DFD)
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Pork Quality
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General Effects of Synthetic Phenethanolamine β -Adrenergic Agonists in Livestock
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