Broiler breeders — the parent birds that produce commercial meat chickens — endure severe feed restriction throughout their lives to prevent the obesity that would prevent reproduction, causing chronic hunger and frustration.
The welfare of broiler breeders represents one of the clearest examples of how selective breeding can create systemic suffering. These birds are genetically programmed to grow rapidly when fed freely, but this growth rate is incompatible with reproduction. The industry solution — severe chronic feed restriction — causes constant hunger that drives frustrated foraging behavior, aggression at feeders, and measurable distress. Behavioral tests confirm breeders are highly motivated to work for food even when doing so is effortful. They show signs of frustration and emotional distress at feeding times. This suffering is invisible to most consumers, occurring deep within the supply chain before any meat chicken is born. Slower-growing genetic lines that do not require such severe restriction exist and are gaining traction, but represent only a small fraction of global production.