Characteristics of cold-induced dark, firm, dry broiler chicken breast meat. 2012

S Dadgar, and E S Lee, and T G Crowe, and H L Classen, and P J Shand
Department of Food and Bioproduct Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, Canada, S7N 5A8. samira.dadgar@usask.ca

1. A study was designed to characterise dark, firm, dry (DFD) breast meat resulting from cold exposure of broilers and compare its properties with normal breast meat from cold-stressed and control birds. 2. A total of 140 broilers were selected from 5- and 6-week-old birds exposed to cold temperatures ranging from -18 to -4°C, or a control temperature of +20°C for 3 h in an environmental chamber. Half of these birds were slaughtered immediately following the cold exposure and the other half were given 2 h of lairage. 3. Breast meat samples were categorised based on ultimate pH (pH(u)) and colour L* (lightness) values into normal (5·7 ≤ pH(u)≤ 6·1; 46 ≤ L* ≤ 53) breast meat from control (control-normal) or cold-stressed (cold-normal) birds, and DFD (pH(u) > 6·1; L* < 46) breast meat, which only occurred in cold-stressed birds (cold-DFD). 4. Residual glycogen was not different between cold-DFD and control-normal breast meat. Lactate concentration was lower in cold-DFD compared with control-normal breast meat. Lactate concentration almost tripled for all the samples by 30 h post-mortem, which resulted in a drop in pH of normal meat, but did not have any effect on pH of DFD breast meat. Glycolytic potential at both 5 min and 30 h post-mortem was lower in DFD breast meat compared with the normal breast meat from both cold-stressed and control birds. 5. Cold-DFD breast meat was significantly darker, with higher pH(u), lower cook loss, higher water-binding capacity and processing cook yield than cold-normal and control-normal breast meat, which were not different from each other.

UI MeSH Term Description Entries
D008297 Male Males
D008460 Meat The edible portions of any animal used for food including cattle, swine, goats/sheep, poultry, fish, shellfish, and game. Meats
D010369 Pectoralis Muscles The pectoralis major and pectoralis minor muscles that make up the upper and fore part of the chest in front of the AXILLA. Pectoralis Major,Pectoralis Major Muscle,Pectoralis Minor,Pectoralis Minor Muscle,Pectoral Muscle,Muscle, Pectoral,Muscle, Pectoralis,Muscle, Pectoralis Major,Muscle, Pectoralis Minor,Muscles, Pectoralis Major,Pectoral Muscles,Pectoralis Major Muscles,Pectoralis Majors,Pectoralis Minor Muscles,Pectoralis Minors,Pectoralis Muscle
D011897 Random Allocation A process involving chance used in therapeutic trials or other research endeavor for allocating experimental subjects, human or animal, between treatment and control groups, or among treatment groups. It may also apply to experiments on inanimate objects. Randomization,Allocation, Random
D002645 Chickens Common name for the species Gallus gallus, the domestic fowl, in the family Phasianidae, order GALLIFORMES. It is descended from the red jungle fowl of SOUTHEAST ASIA. Gallus gallus,Gallus domesticus,Gallus gallus domesticus,Chicken
D003080 Cold Temperature An absence of warmth or heat or a temperature notably below an accustomed norm. Cold,Cold Temperatures,Temperature, Cold,Temperatures, Cold
D005260 Female Females
D006799 Housing, Animal The physical environment in which animals are maintained. Animal Housing
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D058639 Cold-Shock Response A sequence of responses that occur when an organism is exposed to excessive cold. In humans, a fall in skin temperature triggers gasping, hypertension, and hyperventilation. Cold Shock,Cold Shock Stress,Cold Stress,Cold-Stress Reaction,Cold-Stress Response,Cold Shock Response,Cold Shock Stresses,Cold Shocks,Cold Stress Reaction,Cold Stress Response,Cold-Shock Responses,Cold-Stress Reactions,Cold-Stress Responses,Response, Cold-Stress,Responses, Cold-Stress,Shock Stress, Cold,Shock Stresses, Cold,Stress, Cold,Stress, Cold Shock,Stresses, Cold Shock

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