Can anyone please explain how egg size and productivity are passed down to the next generation? I read that egg laying ability is passed on through the roo, is that true? And what about egg size? Also I assume that breeding for utility is a more slow and time consuming process than breeding purely for looks. Because you'd want to assess birds for productivity before you started breeding from them. You couldn't just start breeding from birds soon after they reached maturity, right? Any info or opinions on this subject would be most welcome!