They say that but it's not true. All major farms that sell chicken meat or eggs use hormones to help increase growth and egg production. There is many other things in the U.S. that they tell us but it's all propaganda.Having access to something green to eat, like grass or alfalfa, will give the yolks more color. It is illegal in the USA to feed chickens or cows hormones and has been for a long time. They do give them antibiotics though.