Selective breeding is the best breeding. I don't know if that is true or not but you will have hybrids with the values of the parents. Size, yield, taste, finish date are all varialble traits to select from when breeding, Choosing the traits you want next time is the easiest wat to breed. When breeding 25% will be like the mother, 50% will be like both parents, and 25% will be like the father. You can determine which ones to cross again, through desirable trait apperance in the offspring. These ones that show the values you desire will stablize the hybrid.