Broiler breeder chickens - the parent birds that produce commercial broiler chicks - are chronically food restricted to prevent obesity and health problems, causing persistent hunger stress that represents a severe welfare problem.
Broiler breeders kept on chronic food restriction experience persistent hunger that welfare scientists consider one of the most severe welfare problems in commercial poultry production. Birds that are genetically programmed to eat constantly are given a fraction of their voluntary intake, creating a state of chronic frustration and hunger stress throughout their entire productive life. Behavioral evidence including excessive time spent in foraging behaviors and strong motivation to obtain additional food confirms the significant welfare cost of this management practice.