what are you back crossing to? And are you line breeding? I'd recomend it line breeding after you cull is the best way to get results fast. I'd recomend father x daughter and then take a daughter off that back to a male from the same cross that produced the hen that was taken to the father. I'm a big fan of line breeding my best results with my show/weight pull apbt's came from father x daughter and mother x son then taking offspring from those two broods together
Wow you line bred your apb's?? That is against all kennel rules. I am taking it that you couldn't sell them as show quality, or even breeding quality. One look at their pedigree would get some strange looks, and most likely have you branded a BYB. which is what registered dog breeders strive not to have connected with their names.
I can't imagine doing it with chickens either. It is just so wrong. Seems to me that would be like a man having a kid with his own daughter, his wife having a kid by his son and marrying the offspring together. Oh wait, I forgot that does happen down here in the south.
Still doesn't make it right.
Line breeding is not accepted through the AKC and other kennel clubs. That is why they keep records and pedigrees.
