 I've got two of the fastest growing breed in the world, Ross 308s. Nugget and Layla are growing fast, particularly Nugget. He's about twice the size of the others. Now the roof. Foxy is my remaining Hubbard. They're a slightly slower growing breed, but he's not much smaller. He is a lot more active than the Rosses though, much more inclined to climb onto the kids' shoulders and run around.