The effect of muscular stresses on the quality of broiler meat

Subject Areas : Veterinary Clinical Pathology

یوسف Doustar ¹ , فرید Sarkarati ² , افشین Javadi ³ , وحید Haji Abalo ⁴

1 - Department of Pathobiology, Veterinary Faculty, Islamic Azad University of Tabriz, Tabriz, Iran
2 - Department of Food Hygiene, Veterinary Faculty, Islamic Azad University of Sarab, Sarab, Iran
3 - Department of Food Hygiene, Veterinary Faculty, Islamic Azad University of Tabriz, Tabriz, Iran
4 - Graduated of Veterinary Medicine, Islamic Azad University of Tabriz, Tabriz, Iran

Received: 2007-04-22 Accepted : 2007-11-11 Published : 2007-08-23

Keywords: meat quality, broilers, Muscular stresses,

Abstract :

Collection and transport of chickens from the production farm to the slaughterhouse causes stress. In this study, the relationship between stress causing factors and broiler meat quality was evaluated. Thirty apparently healthy 60-day-old broilers of the same sex and breed were allocated equally to three groups (A and B as treatment and C as the control group). The nutritional and rearing conditions were similar for all groups. Broilers in the first treatment group (A) were subjected to various muscular injuries similar to those occurring during gathering and transfer to abattoir while those in the second treatment group (B) were forced to flap their wings severely. Twelve hours after exertion, blood samples were collected for measurement of creatine phosphokinase (CPK) and total volatile nitrogen (TVN) levels and tissue samples were taken from deep pectoral muscle to prepare microscopic sections in all groups. Macroscopically, swelling, bruising and severe hemorrhage was evident in deep pectoral muscle of the treatment groups, while edema, degeneration, necrosis and infiltration of heterophiles, lymphocytes and macrophages were observed microscopically.  Specific tissue changes were not seen in the control group. The levels of CPK and TVN had increased in treatment groups compared to the control group and their mean differences were also statistically significant (P<0.005).  

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