 Charles has spent most of his farming career producing chickens to the highest intensity standards allowed in this country, raising as many as possible as fast as possible and selling them cheap. But around two years ago, he changed the way he did things a bit. Ross 308s are the standard fast-growing intensive broiler birds. I've got two of them at home, that's Nugget and Layla. They can reach slaughter weight in as little as four weeks.