Temperature Acclimation and Its Effects on Porcine Muscle Properties in Two Humidity Environments

SUMMARY— The effects of temperature and humidity on postmortem and associated muscle properties during growth of “stress susceptible” pigs were evaluated. Exposure to ambient temperatures of 32 and 21°C for alternating 3-day periods caused rapid post-mortem glycolysis, high percent light reflectance, and increased light to dark fiber ratios in the longissimus dorsi muscle as compared to constant (27°C) temperature, but only in moderate (38–42% relative) humidity environments. The above events due to temperature acclimation were masked when the humidity was low (17–23% relative). Humidity effects that were independent of temperature acclimation resulted in high percent light reflectance and high muscle temperature in the post-mortem muscle of pigs reared in low humidity. No significant differences were found in lactic dehydrogenase or succinic dehydrogenase enzyme activities of longissimus dorsi or gluteus medius muscles.

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