I am in the beginnigs of a project: I am trying to create a White chicken that lays like a Leghorn, but I want it to lay brown eggs, and be big. So far, just getting it started so it will be awhile before I'm ready for the next step. I have crossed my White Plymouth Rock rooster to some Red/Gold Sexlnks (from Ideal Poultry). Wide range of colors from these 18 that I have hatched, but I'm only going to keep the white ones to breed on. Now to explain here, the sexlinks lay great but have a tendency to lay eggs 3x's the size of a jumbo (maybe a little exaggeration) and their shell really need to be smoother. My White Plymouth Rocks Are fairly good sized chickens (hatchery) but they are laying a mediumish sized egg. So what do you experts think I need to add in my next step: Size (would like hens to be around 6 to 7 pounds and roosters around 10 pounds, Would White Cochins or White Jersey Giants be the best one to add for size? Any other suggesations?