Broiler Breast Muscle Myopathy: A Modern Welfare Crisis

Wooden breast and white striping are muscle disorders affecting modern fast-growing broiler chickens at high rates, causing pain and reducing meat quality simultaneously.

Key Facts

Wooden breast disorder affects up to 50% of birds in some fast-growing broiler strains
The condition causes muscle fiber degeneration, fibrosis, and inflammatory infiltration
Affected birds show reluctance to move and postural abnormalities suggesting pain or discomfort
White striping, a milder condition, affects over 90% of fast-growing broilers in some studies
Both conditions emerged or intensified as birds were selectively bred for faster growth and larger breast muscles

Welfare Considerations

Wooden breast disorder illustrates how commercial selection for production traits can create welfare problems not anticipated during breeding decisions. The condition is caused by insufficient oxygen supply to rapidly growing breast muscle tissue, leading to tissue death and fibrosis. Birds with severe wooden breast are less mobile and may experience chronic pain. The irony is that the selection pressure producing the largest breasts has created the conditions for those muscles to degenerate. Welfare-conscious broiler production increasingly uses slower-growing breeds that have substantially lower myopathy rates.

What You Can Do

Choose chicken products from slow-growth breed suppliers where labeled
Support welfare certification schemes that prohibit fast-growing breeds with high myopathy rates
Advocate for retailer commitments to better chicken welfare standards
Reduce chicken consumption overall to lower demand on intensive broiler production