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Due to intensive selection, broiler chickens have become the most efficient meat producing animals, attaining exceptionally rapid growth. However, several studies indicate that fast-growing varieties exhibit various muscle tissue defects – myopathies – which adversely affect the poultry meat industry. In particular, recent decades have seen an increase in the incidence of breast muscle abnormalities such as myopathy of the minor (deep) pectoral muscles and pale, soft and exudative (PSE) meat, and more recently white fibres called ‘white striping’, hardening of the breast muscle known as ‘wooden breast’, and intramuscular connective tissue defects (‘spaghetti meat’). These abnormalities increase the occurrence of lower quality fresh meat for the retail market and to some extent reduce the nutritional, sensory and technological properties of raw meat used for further processing. The prevalence of these conditions indicates that further improvements in the efficiency of the meat industry and meat production may be constrained by the physiological capabilities of broilers, as their internal organs, vascular system and skeleton appear to be close to their functional limit. Hence, a problematic question is whether it is better to continue to set new performance goals for animals or to consider a step back in the selection process and attempt to reduce the extent of these emergent quality issues.

Meat defects and emergent muscle myopathies in broiler chickens: implications for the modern poultry industry