Just trying to figure out how I can get some utility back in some show birds. Complete newbie at selective breeding so bear with me. I want to improve my strain of Light sussex. I want to get bigger size fowl, faster and laying more eggs (who doesn't). If I was to cross a LS roo with a RIR pullet then choose the best Roo from offspring and mate back to a LS pullet then for the next 4 or 5 generations selectively choose the best roo of each generation to mate back to a LS mother, I will pretty much be at pure Light sussex again. If I have been selecting carefully will I still be able to keep most of the vitality and egg laying and growth rate that comes with the original crossing of Light Sussex with the RIR?