ok ok I will try to explain....ALL conishX grow Fast and will die of overfeeding ALL of them, including the parent and grand parent line...Parent line? well they are what they breed together to give you the end product...BUT they themself are somewhat different to each other WHY? well you see there are the Dame line and the Sire line, the Sire line(the ones that I have) have all of the CornishX factors:Fast Growth, awesome FCR but they have a much larger Frame.........the Dame line of cornish is a CornishX with Fast Growth, AWEsome FCR(feed covertion ratio) but they are dedicated prolific layers.....when they mate a Rooster from a Sire line with a Hen of a Dame line you get the END product(what you all guys get)......
why do they do this?...well to reduce overall production costs....the breeder Hens(Dame line) is a smaller and a much more prolific layer than the Dame hens, they are only use to produce the big frame Males...