Commercial turkeys have been selected for extreme rapid growth that causes severe health and welfare problems, with slower-growing breed alternatives now gaining market acceptance.
Commercial turkey welfare represents one of the most extreme examples of breeding-induced welfare compromise in livestock farming. The intensive selection for rapid breast muscle growth has produced birds whose anatomy is fundamentally altered from their wild ancestors: turkey poults grow from 50g at hatch to over 20kg in 14 weeks, a growth rate that places enormous metabolic demand on developing systems. The hypertrophied breast musculature shifts the bird's centre of gravity forward, causing difficulty standing, walking, and accessing food and water. Skeletal systems cannot develop adequately to support rapid muscle growth, leading to leg weakness, deformity, and lameness that affects the majority of birds by slaughter age. Artificial insemination, required because the birds' breast conformation prevents natural mating, involves handling that causes stress in both males collected and females inseminated. The contrast with slower-growing breed turkeys is dramatic: birds with more moderate growth rates show substantially lower rates of lameness, better activity levels, and fewer metabolic disorders. Slower-growing breeds require more feed and housing space per unit of meat produced, explaining their higher price point - but welfare-conscious consumers willing to pay for this difference can drive market change.