A dark, firm dry-like condition in turkeys condemned for cyanosis

Abstract

A case-control study (n = 130) was conducted on toms condemned for cyanosis. Color (CIE L*a*b*), pH, and physical characteristics were measured on the Pectoralis major at slaughter and after 24 h. Meat from carcasses condemned for cyanosis had dark, firm, dry-like traits. It was darker and redder and showed higher water-holding capacity, lower cooking loss, and higher gel strength than did controls. Perimortem pH was negatively correlated with the lightness (L*) of meat at the time of slaughter (r = -0.58) and at 24 h postmortem (r = -0.64), positively correlated with water-holding capacity (r = 0.73) and gel strength (r = 0.43) and negatively correlated with cooking loss (r = -0.50). Ultimate pH was negatively correlated with lightness (L*) of meat at slaughter time (r = -0.62) and at 24 h postmortem (r = 0.79) was positively correlated with water-holding capacity (r = 0.87) and gel strength (r = 0.61) and negatively correlated with cooking loss (r = -0.52). Tests based on pH and L* of the P. major were also assessed; tests based on pH had a sensitivity in the range of 0.79 to 0.89 and specificity (Sp) of 0.60 to 0.94. Tests based on L* showed sensitivity of 0.75 to 0.92, and specificity of 0.79 to 0.97. The repeatability of measurements varied from good (L*: rho = 0.6) to excellent (pH: rho = 0.92). Overall, turkey breast condemned for cyanosis showed dark, firm, dry-like traits. Tests based on color and pH are described as a means of identifying turkeys condemned for cyanosis.