Sorry, I can't remember where I saw this on the internet but I did write it down and got curious to ask about it. This site said this was the Cornish X formula. I know it's supposed to be a heavily guarded secret but maybe some disgruntled employee leaked it. Who knows! Thought I would share and see what others thought. Indian Game Cock (Cornish) to Leghorn hen - keep the hens RIR cock to White Wyandotte hen- keep the cocks Breed the saved hens to the cocks and save the hens Breed those hens to a Plymouth rock cock -Wallah! supposed to be THE Cornish Cross Am curious also, if this is true, which cross adds the fast growth?