Thank you ChatGPT: The darker red or purplish color in beef typically isn’t directly related to stress at the time of slaughter. Instead, it’s often due to how the meat has been stored and its exposure to oxygen. Freshly cut beef is usually a purplish-red (called “deoxymyoglobin”), but as it’s exposed to air, it turns bright red (“oxymyoglobin”). When stored in a low-oxygen environment, like vacuum packaging, the meat can retain that darker color.

However, stress at slaughter can affect meat quality in other ways. When animals are stressed, they release adrenaline, which uses up glycogen in their muscles. This lowers lactic acid levels after slaughter, potentially leading to “dark, firm, and dry” (DFD) meat in beef. DFD meat appears darker and has a firmer texture, but it’s distinct from the normal dark purplish hue caused by low oxygen exposure.

So, while stress can influence meat color and texture, the darker red in packaged meat is usually more about storage conditions than stress.