Effect of stunning current frequency on carcass downgrading and meat quality of turkey.

The objective of this study was to determine the effect of frequency of a 150 mA water-bath stunning current on turkey hen carcass and meat qualities. Fifty turkey hens were subjected to water-bath stunning with alternating current of various frequencies: 50 Hz (n = 12), 300 Hz (n = 14), 480 Hz (n = 12), and 600 Hz (n = 12); the duration of stunning was 4 s for each bird. Carcass defects such as engorged wing veins, red wing tips, and hemorrhages were recorded. Turkey meat quality traits (M. Pectoralis major) were assessed based on rigor mortis development, color, drip loss, cooking loss, tenderness, and cooking yield of cured products. The data showed that frequencies of 480 Hz and 600 Hz are associated with an increased rate of postmortem pH decline (during bleeding). This effect is most likely due to the occurrence of vigorous wing flapping during the first 3 min poststunning. Under the experimental conditions of the present work, the increase in rate of pH decline after stunning at 480 and 600 Hz did not induce carcass and meat quality defects. However, before any recommendation is given, the influence of stunning frequency on turkey meat quality needs to be evaluated under industrial conditions.

[1]  C H Veerkamp,et al.  The effects of alternative electrical and mechanical stunning methods on hemorrhaging and meat quality of broiler breast and thigh muscles. , 1996, Poultry science.

[2]  A. Sosnicki,et al.  PSE‐LIKE SYNDROME IN BREAST MUSCLE OF DOMESTIC TURKEYS: A REVIEW , 1998 .

[3]  S. Wotton,et al.  Effectiveness of electrical stunning applied using a variety of waveform-frequency combinations and consequences for carcase quality in broiler chickens. , 1998, British poultry science.

[4]  L. Wilkins,et al.  Relationship between wing flapping at shackling and red wingtips in chicken carcases , 1989, Veterinary Record.

[5]  L. Wilkins,et al.  Effect of stunning current on downgrading in turkeys. , 1989, British poultry science.

[6]  D. L. Fletcher,et al.  A comparison of high current and low voltage electrical stunning systems on broiler breast rigor development and meat quality. , 1997, Poultry science.

[7]  A. Sosnicki,et al.  Effect of rapid rigor mortis processes on protein functionality in pectoralis major muscle of domestic turkeys. , 1997, Journal of animal science.

[8]  J. Lepetit,et al.  Post-mortem evolution of rheological properties of the myofibrillar structure. , 1986, Meat science.

[9]  A. Sams,et al.  The effect of seasonal heat stress on rigor development and the incidence of pale, exudative turkey meat. , 1997, Poultry science.

[10]  R. J. Buhr,et al.  Influence of preslaughter stunning on turkey breast muscle quality. , 1998, Poultry science.

[11]  X. Fernandez,et al.  The effect of current frequency during waterbath stunning on the physical recovery and rate and extent of bleed out in turkeys. , 1999, Poultry science.

[12]  F. B. Mather,et al.  The Effect of Preslaughter Temperature, Stress, Struggle and Anesthetization on Color and Textural Characteristics of Turkey Muscle , 1978 .