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Early postmortem electrical stimulation simulates PSE pork development.

J E Hammelman1, B C Bowker, A L Grant

  • 1Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA.

Meat Science
|November 9, 2011
PubMed
Summary
This summary is machine-generated.

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Electrical stimulation (ES) of pork carcasses within 25 minutes postmortem creates PSE-like quality. Early ES impacts muscle pH, temperature, and metabolites, offering insights into pork quality development.

Area of Science:

  • Meat Science
  • Animal Science
  • Food Science

Background:

  • Electrical stimulation (ES) is used in meat processing to improve meat quality.
  • Understanding the optimal timing for ES is crucial for achieving desired meat characteristics.

Purpose of the Study:

  • To investigate the effects of different postmortem timing of electrical stimulation (ES) on pork quality attributes.
  • To determine the impact of ES on muscle pH, temperature, metabolite concentrations, and physical meat quality characteristics.

Main Methods:

  • Carcasses from 64 gilts were subjected to ES at various time points (3-55 min postmortem) or left untreated (NS).
  • Muscle temperature, pH, and glycolytic metabolite concentrations (glucose 6-phosphate, glycogen, lactate) were measured at multiple time points postmortem.

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  • Color, firmness, and water-holding capacity were assessed.

    • Main Results:

    • ES applied within 25 min postmortem significantly lowered muscle pH and increased temperature, creating PSE-like (pale, soft, exudative) characteristics.
    • Early ES (before 45 min) increased muscle lactate concentrations.
    • ES at 45 and 55 min postmortem resulted in higher 24-h muscle glucose 6-phosphate.
    • ES at 3 and 15 min postmortem led to lower glycogen, color, and firmness scores.
    • ES at 3 and 25 min postmortem reduced water-holding capacity.
    • No significant effect of ES on CIE L*, a*, b* color values or 24-h muscle pH was observed.

    Conclusions:

    • Electrical stimulation of pork carcasses within the first 25 minutes postmortem induces PSE-like meat quality.
    • The timing of ES critically influences muscle biochemical changes and subsequent meat quality traits.
    • ES can serve as a valuable model for studying the development of pork quality characteristics.