Broiler breeder parent birds — the chickens that produce eggs hatched into commercial broilers — suffer severe chronic hunger from the feed restriction imposed to prevent obesity-related health problems caused by their fast-growth genetics.
Broiler breeder welfare represents one of the most ethically troubling welfare problems in commercial poultry production because it is built into the genetics of the birds themselves. The birds cannot be fed to appetite because their genetics drive growth rates their cardiovascular and skeletal systems cannot support — the welfare harm of chronic hunger is traded against the welfare harm of premature death from metabolic disease. Feed-restricted breeders experience persistent, intense hunger throughout their 40-60 week lives. The evidence is unambiguous: they consume substrate material (feathers, bedding) obsessively, show stereotypic pecking at empty feeding systems, and demonstrate in cognitive tests that food motivation is the dominant drive shaping their behaviour. The only genuine solution is to change the genetics — breeding for moderate growth rates that allow breeders to be fed to appetite without metabolic collapse. Some slower-growing commercial lines are reducing the restriction required, but the core problem remains in the dominant fast-growth sector.