I read a lot about things that interest me. Often it leaves me wanting to scream. Today it is short legged lethal factor. One source denies it exists-a second source says that if short is bred to long no lethal factor-another says that 25% will die-two sources said only two percent of embryos will die. With my short legged serama rooster 50-60% DIS. Recently I switched roosters (long legged) and the first clutch has 9 out of 10 eggs living; the 14 day will be Thursday. Can someone tell me with certainty (1st hand experience) how the lethal factor works?