Now I must stress here that the adnormilties, madness, and other deteriation of the bird aren't taken into account, nor that it is most likely will happen over a short period of time. The quicker the out cross in that case the better of course. You will quickly be breeding culls if over done. But I thought that for those interested in 'Incest Breeding' the questions of why, and how needs to be assertain before one starts out on this course. http://www.racingbirds.com/breeding.html