I've been trying to find this video for a while, these are Cobb 500 Great Grand parents Males, Sire Line A males and Dame Line C males(ABCD four way breeding) these breeder males go thru a prosess called Broilerization where they fed un restricted until they reach market Weight of about 2.5 Kilos(about 5.5 Lbs) in about 5-6 weeks and only about 12% are kept as Grand Parent Breeders. So anyone who believes that the end product grow as fast as they do because of "Hybrid" Vigor it's being mislead.