Here most are livestock, most. All are known as individuals where relationships over multiple generations are tracked in a ledger. A percentage of the livestock birds have names as well, like one does with lead cows or horses A very small number are outright pets and suffer intense handling, especially by the public. Some in last group are selected shortly after hatch although a fair number are selected after demonstrating exceptional productivity during their productive lifetime. The livestock birds have culling start almost from hatch and it continues up until about 5 years post-hatch. Birds allowed to past the 5 year mark start getting the pet treatment and that can last an additional several years.